A dog with gastroenteritis needs a low-fat, easily digestible diet built around a single lean protein and a simple carbohydrate. The classic combination is boiled chicken breast mixed with boiled white rice at a ratio of roughly one part protein to four parts rice. This bland approach gives the gut time to recover without triggering more vomiting or diarrhea, and most dogs can start transitioning back to their regular food within three to five days.
Start With Small, Frequent Meals
The traditional approach was to fast a dog for 24 to 48 hours after the onset of vomiting and diarrhea. More recent veterinary thinking leans toward “feeding through” the illness with small portions rather than withholding food entirely, especially for puppies and small breeds who can become dangerously low on energy. If your dog is still actively vomiting, hold off on food for a few hours until the vomiting settles, then offer a tablespoon or two of bland food. If that stays down for an hour, offer a little more.
Feed four to six small meals spread throughout the day rather than one or two large ones. A smaller volume at each sitting puts less strain on an inflamed stomach and intestines. Gradually increase portion sizes over the next two to three days as symptoms improve.
The Standard Bland Diet
The most widely recommended recipe is simple: boiled boneless, skinless chicken breast mixed with plain boiled white rice. Use about two cups of rice for every half cup of shredded chicken. That 4:1 ratio keeps the meal very low in fat while providing enough protein for basic nutrition. Boil the chicken thoroughly in plain water with no seasoning, oil, or butter, then shred or finely chop it before mixing.
White rice works better than brown rice here because it’s lower in fiber and easier to digest. You can substitute boiled white potatoes, boiled plain pasta, or instant rice if that’s what you have on hand. For the protein, acceptable swaps include lean ground beef (93% lean or higher), pork loin, egg whites, low-fat cottage cheese, or plain low-fat Greek yogurt. UC Davis veterinary nutrition guidelines specifically mention cottage cheese and rice as a go-to bland combination for acute gastrointestinal disease.
If Your Dog Has a Chicken Allergy
Some dogs react to common proteins like chicken or beef, which complicates the standard bland diet. In that case, try a novel protein your dog hasn’t eaten before. Lamb is gentle on sensitive stomachs and high in protein. Fish like pollock or salmon is naturally lean. Venison, rabbit, and bison are other options, though they can be harder to find. Stick with the same 4:1 ratio of carbohydrate to protein, and keep preparation plain: boiled or baked with zero seasoning.
What Not to Feed
Fat is the biggest concern. Dietary fat slows the movement of food from the stomach into the intestines, which can worsen nausea and discomfort. In a dog whose gut is already inflamed, extra fat also makes diarrhea worse because the digestive system can’t break it down efficiently. That means no fatty meats, no cooking oils, no cheese (except low-fat cottage cheese in small amounts), and absolutely no table scraps or rich treats.
Avoid high-fiber foods as well. While fiber plays an important role in a healthy dog’s diet, too much during an active bout of gastroenteritis can swing symptoms from diarrhea to constipation or reduce nutrient absorption at a time when your dog is already depleted. Skip raw vegetables, high-fiber dog treats, and whole grains until recovery is well underway. Dairy products (other than the low-fat options mentioned above), spicy foods, and anything with onion, garlic, or artificial sweeteners like xylitol are always off limits.
Keeping Your Dog Hydrated
Dehydration is the most immediate danger with gastroenteritis. Vomiting and diarrhea drain fluids and electrolytes fast, especially in small dogs and puppies. Make sure fresh water is always available. If your dog is drinking but not vomiting, you can offer a pet-specific oral electrolyte solution, available at most pet stores, in small amounts throughout the day. Unflavored Pedialyte diluted with water is sometimes used as a short-term substitute.
Plain, unsalted bone broth (cooled to room temperature) can also encourage a reluctant dog to drink while providing a small amount of nutrition. Avoid giving electrolyte solutions to a dog that is still actively vomiting, as it can make things worse. A dog that refuses water, has dry or tacky gums, or has skin that stays “tented” when you gently pinch it is showing signs of dehydration that need veterinary attention.
Probiotics Can Speed Recovery
Adding a probiotic supplement may help your dog bounce back faster. In a controlled study of 120 puppies with gastroenteritis, those given a multi-strain probiotic for seven days had dramatically better outcomes: 70% achieved excellent recovery, compared to the placebo group where over a third had poor recovery and another 30% showed only fair improvement. The probiotic group also had significantly more beneficial gut bacteria at the end of treatment.
Look for a veterinary-formulated probiotic that contains strains from the Lactobacillus, Enterococcus, or Bifidobacterium families. These are the genera most commonly approved for canine use. Sprinkle the probiotic over the bland diet once your dog is keeping food down. Probiotic pastes designed for dogs are another option and can be easier to administer.
Transitioning Back to Regular Food
Once your dog has had solid, normal-looking stools for at least two consecutive days on the bland diet, you can begin mixing in their regular food. A gradual transition over five to seven days prevents a relapse. Start by replacing about 25% of the bland diet with regular food on days one and two. Move to a 50/50 mix on days three and four. By days five through seven, you should be at 75% regular food and can phase out the bland portion entirely.
If diarrhea or vomiting returns at any point during the transition, drop back to the full bland diet for another day or two before trying again. Some dogs need a slower transition, particularly if the gastroenteritis was severe.
Signs That Need Veterinary Attention
Home feeding is appropriate for mild gastroenteritis, but certain symptoms signal something more serious. Blood in vomit or stool points to hemorrhagic gastroenteritis, which requires urgent veterinary treatment. Repeated vomiting that prevents your dog from keeping any food or water down, lethargy, bloating, abdominal pain, drooling, seizures, or increased urination all warrant an immediate call to your vet. If a puppy or senior dog stops eating entirely, don’t wait. Their reserves are smaller, and dehydration sets in quickly.
As a general rule, if vomiting and diarrhea haven’t improved significantly within 48 hours of starting the bland diet, your dog likely needs professional evaluation rather than continued home management.