Dog Yellow Vomit, not Eating, Lethargic, with Blood, after Eating Grass

Dog yellow vomit

Animals, just like human beings, are bound to suffer stomach upsets. As such, occasional dog vomiting is normal. The characteristics of the vomitus can go a long way in pointing out what the cause of vomiting is and if there is a need for concern. Dog yellow vomit indicates that the dog is expelling bile; a sign that their stomach is empty. We get into the details of these, dog vomits yellow slime, lethargy, failure to eat and what to do when there is blood in vomit.

Dog Yellow Vomit

When it comes to dog vomiting, how, when and what a dog eats have an effect on it. In addition, some health conditions may see your dog throwing up. Depending on the cause of vomiting, the emitted content will adopt varying characteristics. These can be used to point back to why your beloved pet is vomiting.

Dog yellow vomit indicates that your dog is vomiting bile. Bile is a digestive liquid secreted in the liver from where it is then transferred to the gallbladder for storage. It is alkaline in nature. Once food has been digested, bile is released into the small intestines where it aids in the digestion of fats.

Bile is easily recognizable due to its distinctive yellow coloration. In most cases when a dog is vomiting bile, there will be no food particles in the vomit. This is because bile is vomited when a dog gets an urge to throw up while on an empty stomach. In some situations, though, the dog may initially vomit food after which they start puking yellow bile.

Reasons why Dog Vomit Is Yellow

What makes a dog vomit yellow bile? There are various causes of bile in the stomach. These include internal parasites, bowel inflammatory disease as well as intestinal blockage.

In usual circumstances, bile will stay put in the intestine. This is enhanced by a closure placed between the intestine and the stomach known as the pyloric valve. In cases where a dog has yellow vomit, it is likely that the brain made commands to initiate the vomiting reflex upon which the pyloric valve opens and bile is emptied into the stomach. If the dog throws up after this, they will emit bile from the stomach through the esophagus and out of the mouth. Where vomiting does not happen, the bile remains in the stomach and could result in gastric reflux in your dog.

In addition to vomiting on an empty stomach, where the dog vomits food for long, their stomachs become empty and as the vomiting continues, they will start vomiting bile indicating that their stomach is empty. Discussed below are various dog yellow vomit causes.

Bilious Vomiting Syndrome

Bilious vomiting syndrome is a condition occurring in dogs after their stomachs have been empty for too long. While the dog is on an empty stomach, there is secretion of acids, mucus as well as bile. Once bile has been produced, it flows into the small intestines. Since there is nothing to absorb it, the bile causes an irritating effect on the dog leading to nausea. What follows is the dog vomiting bile.

Dog yellow vomit that is as a result of bilious vomiting syndrome usually occurs at night or early in the morning since this is when the dog’s stomach goes the longest without food. It is most common in dogs that are fed only once per day.

To counter this, you could resort to feeding your dog smaller portions of their daily requirement so as to enhance more frequent feeding. Bedtime and early morning snacks could also help break the vomiting cycle.

Intestinal Blockage

When dogs suffer blockage from hairballs, toys, bones or other objects, food is prevented from going beyond the blockage. As a result, vomiting is likely to occur. This will likely be repeated and accompanied by severe pain, constipation, dehydration, and loss of appetite. Due to the continuous vomiting, the regular vomiting is exhausted and dog yellow vomit is expelled as the stomach will be empty.


Pancreatitis refers to the inflammation of the pancreas. According to, this condition is precipitated by consumption of high-fat meals. These may include bacon droppings, greasy human food among other oily foods. Once they have consumed these, the dog will develop symptoms such as severe vomiting, fever and a painful belly 24 to 72 hours after consumption. Treatment for this includes prescription food and a course of antibiotics.

Irritable Bowel Disease

This is another reason why you may find dog yellow vomit around your home. It leads to chronic irritation in the intestines which, as a result, causes random vomiting. To counter this, it is advisable to offer your dog highly digestible food formulations.

Drinking Too Much Water

When a dog has an upset stomach, a further upset may occur in case they drink too much water. Since they might have vomited out all the food, they will throw up bile upon drinking too much water.

Since vomiting requires that you give your dog water constantly to ensure maximum hydration, in case they are drinking uncontrollably you can offer them ice cubes so they can lick. This eliminates the possibility of gulping down more water than is necessary and avoid further irritation while ensuring they remain well hydrated.

Eating grass

Dog yellow vomit after eating grass is quite common. Many dogs will vomit after eating grass. In such cases, the dog will vomit yellow foam with grass. Dogs eat grass when they have an upset stomach to help in expelling the contents of their stomach.  Occasional eating of grass by dogs is not dangerous as long as the lawn has not been treated with any chemicals.

Food Allergies or Sensitivities

Dogs suffering food sensitivities and allergies can easily vomit bile. In most cases, this happens after a change in dog food brands. Check on whether there are different ingredients from what your dog is used to and if you can identify some, they could be the problem. It is also possible for a dog to develop sudden sensitivity to the food they have been eating. Your veterinarian can help identify what ingredient your dog is reacting to.

Digestive Problems

A dog with an upset stomach resulting from consumption of inappropriate materials, stale food and any other thing that does not auger well with their stomach is likely to vomit. Once a dog is experiencing regular vomiting from an upset stomach and it gets to a point where the stomach gets empty, they will start expelling yellow vomit.

Dog Vomit Yellow Bile Not Eating

As discussed above, a dog will vomit yellow slime, mucus, foam or liquid when their stomach is empty. Once a food is reintroduced, they should be eager to have some. When a dog vomits yellow bile and is not eating, there is a likelihood that he is suffering a gastrointestinal obstruction. This could result from ingestion of foreign materials such as socks, rocks, plastics or toys. As a result of the blockage, the dog gets an urge to vomit but loses their appetite and can’t eat since food can’t pass through. Excessive drooling may also be observed.

To be certain about this, it is necessary to visit a veterinarian. Upon examination and if need be, they will settle for the most appropriate method of removal.

Dog Vomiting Yellow Bile, Lethargic, and Blood in the Vomit

When a dog is vomiting yellow bile and appears lethargic, gastritis could be the cause. This refers to inflammation and irritation of the stomach’s lining. In addition to vomiting, your pup will show other clinical signs such as general weakness, lethargy, inappetence, and blood in the stool.

When they vomit, the dog yellow vomit will be foamy and have flecks of blood in some cases. Where these accompanying symptoms are observed, it is best to visit your veterinarian immediately so they can be treated.

When to be Concerned about Dog Yellow Vomit

What do you do when a dog has yellow vomit? In some cases, no visit to the veterinarian is necessary. However, there are times when the vomiting may be indicative of serious health issues. Below are situations in which dog yellow vomit warrants a visit to your vet.

Occasional vomiting in dogs is nothing to be scared of. When it happens, withhold food and water for a few hours and if the vomiting stops and there are no additional symptoms, try offering your dog some water. If they drink and manage to hold it down, you can offer him some bland food. You should, however, be concerned and seek veterinary attention if:

  • Vomiting continues even when no food is offered, visit your vet
  • Your dog goes on vomiting endlessly.
  • In case there are additional symptoms such as diarrhea, lethargy, inappetence or blood in the vomitus have them checked.
  • Whenever in doubt about the dog yellow vomit or any other health issue. Remember it is always better to be safe than sorry.


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