Bilious Vomiting Syndrome in Dogs

Also known as “hunger pukes” or the obvious “bile vomiting”, the vet industry calls it “Bilious Vomiting Syndrome”. You’d think anyone who uses an impressive term like that one to describe a condition in which a dog regularly pukes yellow liquid would know a bit about the problem. However, like so many other examples in veterinary and medical “science”, fancy names are invented for diseases which are complete mysteries and destined to forever remain so.

Should stomachs contain food 24/7?

Astoundingly, there seems to be consensus among vets that the real underlying cause of this condition is an empty stomach. They seem to forget that dogs have been walking around on this planet with empty stomachs 95% of the time during the millions of years they’ve been here. Even the relatively spoiled reintroduced wolves in Yellowstone only eat every third day on average. Other wild dogs not so well fed have been known to go weeks or even months without food, with no harmful effects.

My experience with bile vomiting

The problem of bile vomiting is very common and difficult to resolve for most dog owners. So much so that many have concluded that it is normal. Personally, I had almost given up trying to figure out why my middle aged Cockapoo periodically vomited bile even after years of raw feeding. As is common, I had noticed that it always happened when his stomach was empty. It usually happened in the morning while I was in the kitchen preparing food. I asked everybody I could think of about this, including vets and expert raw feeders. I was always told that it’s just the sign of an empty stomach and I should feed my dog more frequently.

That was 23 years ago. I wish I could say that knowledge about this condition and how to resolve it has come a long way. Unfortunately, that’s not the case. Here’s a sampling of recommendations from some of the highest ranking veterinary websites:

From A dog may vomit yellow foam simply because his stomach is empty and the bile can be irritating. If your dog is otherwise healthy — and he’s eating and defecating normally — it may help to reduce the time in between meals.

From dog health Yahoo Contributor Adrienne J. Farricelli CPDT-KA: Many owners complain that their dogs throw up yellow bile in the early morning. In this case, the bile may simply be the result of the dog’s empty stomach… The solution to this problem is often pretty simple and straightforward. All that may be needed is to feed the dog a small meal right before bed time. This should help settle the stomach and ultimately solve the problem.

And here we have someone who’s at least on the right track — Dogs Naturally Magazine’s “Ask the Vet”:

Ah, the old common (but not normal) early morning bile vomiting syndrome. There are lots of possible causes for your pups to be doing this, but my first suspicion is that they don’t like or do well with their dry food diet. It is possibly an intolerance to one or more of the ingredients or even a food allergy. Therefore, the first thing I would do in this situation since all four are effected (sic) by this problem is to stop feeding dry food. Although many dogs can do well with this processed food, some cannot tolerate it. Personally, I try not to feed any brand of kibble to my own dog (she eats a variety of raw foods) and advise my clients to do the same.

He goes on to recommend a specific, remedial diet: Start with a bland diet and see if this helps the vomiting. Low fat cottage cheese or boiled white meat chicken plus mushy rice is one of my (sic) that works well. Mushy rice is rice cooked well enough so that there are no whole grains left. Like baby rice cereal. Alternatively, you can “blenderize” cooked rice that you already have made by adding it and a little water or organic chicken broth into the blender.

Almost by accident, this type of diet might well resolve the problem temporarily, although it has little to do with “blandness”. As I will soon explain, these foods don’t contain the particular constituent in excessive quantities that causes bile overproduction. They are not healthy foods, however, and will create disease if fed long term. In addition, when the dog owner goes back to feeding the dog’s regular food, the problem will eventually recur. I should also note that although it is implied in the article that this problem is exclusive to kibble fed dogs, it is not. Bile vomiting occurs in raw fed dogs as well as kibble fed.

More investigation and cogitation

When I was trying to unravel this mystery on behalf of my own dog, it didn’t make sense that the cause could be an empty stomach. As I’ve already pointed out, the stomachs of wild dogs are empty most of the time. One key difference seemed to be that when the bodies of wild dogs prepare to eat it’s because the prospect of food is real and imminent. Domestic dogs have no feeding autonomy. They are dependent on us for food, and it seems reasonable that their bodies can be triggered into preparing for it as a habituated response to certain environmental stimuli. This will happen whether or not food is actually forthcoming.

Getting closer to a solution

So it seemed obvious to me that a combination of conditioning and my activity in the kitchen was causing my dog’s body to prepare itself for food. The act of hunting would do the same if he was living in the wild. Part of that preparation process involves enzymes and digestive fluids being secreted into the stomach to assist with the breaking down of the anticipated foods. So, I theorized that when foods are not actually forthcoming, bile and other assorted secretions irritate the stomach lining, which causes the body to eject them through vomiting.  It’s true that bile is alkaline but it should be pointed out that alkaline/base substances can still be irritating or even corrosive.  Most drain cleaners, for example, are alkaline.

Digging deeper

Many others have come this far in their thinking without getting any closer to understanding the underlying pathological cause.  It still doesn’t jibe with the natural model to think that whenever a wild dog has an encounter with prey that doesn’t pay off he then has to go get rid of the bile in his gut.  Clearly there’s something else going on with domestic dogs. To get to the bottom of it requires taking a look at the function of bile. The job of bile in the digestive process is to break down fats. It seems logical to conclude that something is causing the body to overproduce bile. If that is the case, it also makes sense that over-consumption of fat may be the cause of the overproduction.

My own dog’s diet was 100% raw at the time he was regularly vomiting bile. But it was very high in fat, perhaps as much as 50% or more by calorie. After putting the theory together in my mind, I decided to immediately test it out. I did this by cutting way back on the fat content of my dog’s food. Previous to this, I had not been in the habit of trimming the fat from his food. I was even feeding a small percentage of cheap ground turkey, which often contains high fat.

Eureka, it worked! Bile vomiting stopped.

Within a few months of sharply decreasing the amount of fat in his diet, my dog’s bile vomiting stopped. After that, it happened a few times a year for a couple years until it stopped completely. Since then, I have passed this information along to many others. When they make the same changes, they get the same successful results. Like with my dog, it can take weeks or months to completely stop but it typically steadily decreases until it stops permanently. I suspect the age of the dog is the primary factor that determines this.

The body does not make mistakes

Some dogs vomit bile in late puppyhood but have decreasing episodes as they grow into adulthood even if the diet does not change. Because of this, some people insist that bile vomiting is a normal part of physiological growth and development. We can be fairly certain this is not the case, however. It takes energy for the body to produce digestive fluids like bile. Living organisms are extremely economical. Everything has a function. The body doesn’t over- or under-produce by mistake, it does so in response to some deleterious influence. Our job is to find and remove the harmful influence.

In addition, there’s an important clue to be noted in the fact that the problem doesn’t usually show itself until a puppy is into the teenage months. What this tells us is that it is a condition that develops slowly over time. It’s just like many other forms of pathological degeneration. In other words, it takes a while for the body to accommodate the need for more bile. It does this as a response to the overabundance of fat in the diet. This most likely occurs earlier in kibble fed dogs than raw fed. Generally the bigger the feeding mistakes the quicker the degeneration.

Do raw fed dogs vomit bile?

One would think that symptoms of all kinds would occur less in raw fed dogs. This is certainly the case generally. When it comes to bile vomiting, however, raw fed dogs are not spared. Bile vomiting is a very popular topic on raw feeding forums. Ironically, dogs on kibble may not actually exhibit the symptom as much as raw fed dogs. That’s because kibble stays in the stomach longer and bile vomiting almost always happens when the stomach is empty. Kibble is also typically fed more often, so the stomach is not empty as much. For this reason, bile vomiting may happen after a dog is transitioned to a raw diet even though the dog never experienced it before. Some “experts” will tell you that kibble actually leaves the stomach quickly. I have reason to conclude just the opposite. Over the years I’ve seen numerous kibble fed dogs vomit their last meal of kibble many hours after eating it and the kibble is nearly intact. Dr. Tom Lonsdale noted in one of his videos that a 5-month-old pup in his care vomited kibble 12 hours after the meal and it was still in its original form.

Raw feeders are also more likely to embrace the idea that dogs need to be fasted regularly. This sets up the opportunity for the symptom to manifest.

Continued causes = continued effects

As a dog gets into adulthood, if the same feeding mistakes continue, the body continues to respond in the only way it can. It produces bile in the quantities it deems necessary to break down the excessive fats in the diet. It is also sometimes noted that dogs begin to bile-vomit less as they get older. However, this does not necessarily mean they’ve “outgrown” the problem, as is sometimes surmised by feeding experts.

What it most likely means is that the stomach lining has become tougher as a consequence of frequent contact with the undiluted bile. Once the membranes are toughened, the cost of having the bile stay in the stomach may be less than the energy and resources required to eject it. Vomiting in general and bile vomiting specifically are costly to the body. If it can find a more efficient way to protect itself, it will. There will always be a cost, however. Like a callous on your hand or increased tolerance for alcohol in humans, a dog’s body will have to give up in sensitivity and vitality what it gains in protection. Increased tolerance always requires a decrease in vitality.

Obviously, a stomach that has had to adapt itself to wrong feeding will not be able to function optimally and efficiently. And since the body operates as a whole unit, there will be other problems caused by these mistakes. They may not show up until much later in the dog’s life. But for our dogs’ sake, it would behoove us to take chronic bile vomiting as an early warning sign. It means that there is trouble ahead if we don’t make changes.

Is frequent feeding the answer to bile vomiting?

Frequent feeding is the best advice the veterinary profession has to offer. However, using this strategy carries additional costs besides bile overproduction. Another of those costs will be that the dog will never be able to go a day without eating at all. This is almost universally recognized now (thank goodness) as a very beneficial practice. Digestion represents the greatest drain on energy of all the body’s various processes. This is particularly true for dogs that are overfed or mis-fed. Regular fasting greatly extends the life of dogs. It replicates what they adapted to in their long biological development as a species.

Good health requires digestive rest

The only time a dog’s body can catch up on its eliminative backlog is when the stomach is empty. We can’t expect to have healthy dogs if we never give their bodies a chance to cleanse and heal, the way nature would. The body does lots of multi-tasking but it has its limits. You don’t have to take my word for this. Just watch your dog turn down food next time he’s highly stressed. Dogs know that digestion cannot happen when stress causes vital energies to be diverted. There are a million examples of how various bodily processes shut down when too much is being asked of the body all at once.

The “testing” rabbit hole

In addition, as it turns out, not only does frequent feeding not solve the underlying problem, it doesn’t even suppress the symptom of bile vomiting in many cases. Sometimes, the stomach will be so irritated by the misplaced gastric fluids that digestion cannot be accomplished. Then, vomiting will happen anyway.

When frequent feeding doesn’t work, vets will often recommend tests that purport to get to the bottom of the situation. Unfortunately, they don’t really do that at all. When vets go looking for diagnoses, they’re not looking for causes that can be stopped. This would actually cost dog owners very little. And it would put all the power in the hands of dog owners. No, they’re looking for something to TREAT. This is often very EXPENSIVE for dog owners. Diagnosing is all about determining which drugs, homeopathic or herbal remedies to administer. It has nothing to do with discovery and removal of cause. For more information on the ineptitude of vets and vet-quoting websites on the issue of bile vomiting, please see my recent critique video.

Individual vets are not to blame

And btw for those who imagine I’m saying vets are laughing all the way to the bank, I’m not. I guarantee it never occurs to most vets that they’re not doing what’s best for dogs and dog owners. It’s what they are TAUGHT that is to blame. For that we have to look at who is “endowing” the educational institutions. “Endowments” from industry, in one form or another, greatly influence what vets are taught. In the current system, this effectively turns vets into drug sellers. The only ones who aren’t acting in that capacity are the “holistic” vets. And that’s only because they don’t sell drugs. But even “holistic” vets are not approaching bile vomiting or any health issue at its root cause. Instead, they are selling remedies and other products that only suppress symptoms, just like drugs.

The big picture

We would do well to consider the suffering of the afflicted dogs as well. Vomiting brings relief from the irritation caused by errant bile, but the act itself is downright unpleasant. For this reason alone, wouldn’t it be better to stay open to finding and removing the causes of this problem? So our dogs don’t have to experience it at all?

What is the cause exactly?

The agricultural animals that we feed to our dogs have a great deal of fat on their bodies. That’s because they are overfed and fed unnatural, high-starch, drug-laced foods. By contrast, the natural diet of most prey animals produces a very low toxic load. And, importantly, much less body fat. These are the animals that our dogs are biologically adapted to eat. The foods that domestic dogs are fed, by contrast, diverge sufficiently from this to cause pathogenic conditions. These conditions are so common that they may seem inevitable, unavoidable, and even “normal”. Bile vomiting is a perfect example. Bile vomiting is common, maybe even so much so that it is “average”, but it is NOT normal. 

A dog does not need to be fed frequently or even fed organic/free-range/expensive foods in order to not suffer this problem.  All of the information a dog owner needs to prevent bile vomiting in his/her dog is in my book.

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24 thoughts on “Bilious Vomiting Syndrome in Dogs”

  1. Hello.
    Let’s say a lot of bile is produced due to fat. Why does it rise and exit through the mouth, and not fall into the small intestine? What causes this reflex? Thank you in advance

    1. It would be difficult to know for sure what motivates the body specifically, but we can use the general principle that the body always seeks the path of least harm to conclude that this spares the more vulnerable small intestine the harm that would result from direct contact with undiluted bile.

  2. One more question, please. Why does this only affect *some* dogs? I have three dogs that all eat the same food. Two of them bile vomit (same breed) and the other breed doesn’t and never has – ever.

  3. I’m sorry my question was for the admin. I read the entire article that makes such sense. So what do kibble and raw diets have in common that make this happen. Most kibble seems to be lower in fat?

    1. There is NO commercial food, NONE, that is truly as low in fat as the foods dogs evolved eating. There are photos in the book of a farmed, dressed rabbit next to a wild dressed one, which illustrates the standard we must adhere to. Farmed animals are deliberately fattened. Wild animals are not. They must remain lean to avoid predation. This is no small consideration, it causes many many problems in the animals that eat these agricultural products.

  4. thank you so much for sending me this article. Very good information. I didn’t want to be negligent by not taking him to the vet. So thank you for sparing me the headache of trying to find someone to tell me what I can find out on my own. 🙂

  5. Thanks for sharing your experience – unfortunately it still doesn’t resolve my dog’s issue as he is fed a diet of a homemade and cooked dinner consisting of kangaroo, veg and rice – a diet that is very low in fat. However, perhaps it completely the opposite; too low in fat?!

    1. No, that’s very unlikely. You’re making a very common mistake in trying to replicate what commercial food processers do — putting everything a dog might need to eat throughout his life in a bowl together, and cooking it to boot. You could very easily resolve your dog’s issues but it will involve correcting these mistakes. The e-book will help you do that.

  6. Thank-you for this. I am beginning my journey with my 18 month old APBT. He was switched to a raw diet at 12 weeks due to a sensitive bowel and it cleared him right up…. except, the morning vomiting remained. We arranged feeding so that it happened less, and really once a month was tolerable, or if we waited too late in the morning without a cookie. The past week or so, he has started again (likely due to the less rigid feeding schedule of quarantine)… even with a morning cookie, poor guy. He has always been a lip licker and burper so I know he has reflux of some type. I want to get your booklet, will it be helpful? I don’t want to put him on meds. He is healthy otherwise, happy and all that.

    1. Yes, the methods outlined in the book will allow you to reverse this condition in your dog. It’s actually quite an easy thing to turn around. I did it and many others have as well. Thanks for your interest and best of luck with your pup.

  7. HI,
    Very intersting article. The question I have is why are you putting wild dog and domestic dogs in the same catagory? As their digestive system works a bit different . Wild dogs have stronger stomach acid , to help with parasites, large amount of food as they might not eat for days ect and a very diffrent diet that is in their natural environment. Domestic dogs digestive system is built more like ours. They are domesticated therefore, since humans decided to play around with DNA and create breeds that should of never been created we see far more health problems and diseas that wild dogs really dont get. Thyroid, diabities , cushions so on. Domesticated dogs need to eat more often , due to the way their digestive system works. well here is another article i read.
    Thank you for sharing ,this motivated me into doing a lot of research..

    1. A dog’s digestive system in no way resembles the human digestive tract! PMR feeders such as the ones at the website you linked are notorious carb-phobes and really have no idea how to beneficially incorporate carbs into a dog’s diet and have no knowledge of the incredible results that are obtainable by doing so. I addressed the subject of the “baggage” that people bring with them when they research dog feeding and how this contributes to misunderstanding the facts in my blog article called “Are Dogs Carnivores or Omnivores”. Please check it out.

  8. Thank you for your insights. We have just been diagnosed with this syndrome by my vet. My dog, an australian shepherd is now 3 years old and had just over the past year been symptomatic (we did not know why she was licking). In the past 2 weeks, it went from being just licks (nauseous) to actually throwing up bile. It is like clockwork at 3 a.m. And is now belching. It is not in the morning when food is being prepped, but always when she has been lying down/sleeping.

    Based on my own personal experience, I have a leaky valve where my bile flows backwards into my stomach (found with a camera). I eat a lot because my stomach hurts all of the time. When I eat the pain goes away. I think my dog may have this same thing. However what I have noticed is that she gets sick when she has been lying down. it is not related to timing, but to her body position. Also it is not related to behavior/food prep. Even in the daytime, if she is lying down, she gets licky. I believe it is a malformation of a valve or sphincter. we have now switched to royal canin gi low-fat and will see how that goes. not too happy with that as I think it is loaded with gluten meal as opposed to quality ingredients.

    1. Please consider proper home feeding. It’s not as time consuming and expensive as you may think, and it more than pays for itself in un-incurred vet bills and dog longevity.

  9. Definitely love the theories and I too didn’t understand how wolves in the wild can fast for long periods of time without issues, that we know of that is …

    My dogs haven’t had this issue until I started them on raw. I am slowly integrating them just doing chicken breast right now and will add bones and organs in the next week or two. The fat theory is kind of debunked considering they get pretty lean chicken breast. I think the conditioning theory is a good one though, something is causing them to do this in the early morning hours before breakfast. This is the longest fast they have (11 hours) and it doesn’t happen during the day.

  10. Thanks for this article – I read it at my wits in. I spent over 1100.00 on vet bills on my 3 year old Llasa apso that had this for 2 months straight – she only weighed 12 lbs and lost 3 in the 2 months. She was so sick – after finally agreeing to have her scoped & they found nothing – I knew I had to do something. She had been on dry Hills Bros Ideal Balance dog food for 2 years. After reading your article I started her on a cooked diet & read everything I could find to make sure I was doing it right and she was getting everything she needed. we have gone now 5 weeks vomit free. Thanks again.

  11. THANK YOU!!!! I’ve been looking for clues about this for a few years now- I have three small dogs, and ALL of them have issues with excess bile which leads to frequent vomiting and lots of air-licking episodes, which I assume result from nausea. Not a fun way to live for them! I’m all about trying to find the root cause of issues and I’ve never thought about fat content before! What specific raw proteins do you suggest feeding that would be low in fat and still balanced? As in, I’m not sure about fat content of organs, etc. I’ve been feeding them a lot of duck, and that’s a fairly high fat protein, I realized. You said you noticed a difference after a few months- in your opinion, should I change to low-fat, and continue feeding the small meals throughout the day + bedtime snack for the first few weeks? My dogs generally can’t go for more than 5-6 hours w/o food, so there’s lots of middle of the night vomiting in our bedroom.

  12. Fascinating article. I’ve been trying to find out for ages why my rough collie vomits bile in the mornings and just generally looks depressed sometimes. This explanation makes so much sense. Thank you for posting it.

    At the moment I’m feeding raw commercial every day (no fasting). Per 100g it has: protein 15.1g; fat 6g; carbs 2.4g. Google says 1g of fat has 9 calories, and protein and carbs are both 4 calories per 1g. Going by that I think the food must be about 43.5% fat by calorie. I think I really need to start fasting and fruit or sweet potato feeding days. Just out of interest, how low would you estimate you reduced fat to in your dog’s diet? The fasting and fruit/sweet potato days will reduce it overall a fair bit but do you need to reduce the amount of fat consumed on meat day as well?

    1. Julie Morris

      Hi There, I noticed that you posted this note over a year ago, and I wonder if you can give me the benefit of your experience since?
      I have a 11 week old rough collie puppy and since bringing him home he has exhibited this “bilious vomiting” mostly at night. He came to us on a kibble dry diet but we have changed to raw food about a week ago and it has not made any difference. My question is based on your experience of reducing fat and feeding frequency what if anything did you find that worked?
      Any help you can give would be much appreciated.

  13. Thank you Nora! I am so happy that you taught me TRUTH! I too saw that my puppy was having problems and as soon as I starting fasting Jemma and feeding her every other day a raw meat and bone diet – it all cleared up. We are going on 4 years of being totally 100% raw because of you! THANK YOU THANK YOU – keep up the super work and get this information out to all the pet owners that really love their pets and want the WHOLE TRUTH and NOTHING but the TRUTH. I love you and I am grateful that you came into my life!

    1. Hi Judy – I read the entire article that makes such sense. So what do kibble and raw diets have in common that make this happen. Most kibble seems to be lower in fat?

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