It can, but it is rarely the brand name alone. Cats get diarrhea from a sudden food switch, a rich or high-fat recipe, an ingredient sensitivity, or an unrelated health problem. If your cat has loose stools after starting Blue Buffalo, the food is worth a closer look, but so is everything else going on with your cat.
Common Reasons a Cat Gets Diarrhea After a Food Change
- Switching too fast. This is the most common cause. A cat’s gut needs time to adjust to a new recipe.
- A rich recipe. Some formulas are high in fat or include extras such as treats and toppers that can upset a cat’s stomach.
- An ingredient sensitivity. Chicken, fish, beef, dairy, or other proteins can bother individual cats. Cats are individuals, and a food that suits one can disagree with another.
- Too much food or too many treats. Overfeeding often shows up as loose stool.
- Something unrelated. Parasites, infections, stress, hairballs, a swallowed object, or chronic conditions such as inflammatory bowel disease can all cause diarrhea, whatever the cat is eating.
How to Switch Cat Food Without Diarrhea
- Days 1 to 3: 25 percent new food, 75 percent old food.
- Days 4 to 6: half and half.
- Days 7 to 9: 75 percent new, 25 percent old.
- Day 10: all new food.
Go slower if your cat has a sensitive stomach. Keep treats to a minimum while you transition, and change only one thing at a time.
When to Call the Vet
Call your veterinarian promptly if the diarrhea lasts more than a day or two, or if you see blood, black stool, repeated vomiting, lethargy, loss of appetite, or signs of dehydration. Kittens, seniors, and cats with other health problems can get sick fast, so don’t wait with them. Don’t give your cat human anti-diarrhea medicine, since some are dangerous for cats. Your vet will tell you what is safe.
What About Recalls and Safety?
Blue Buffalo, like most large pet food brands, has had recalls over the years. You can check current notices on the U.S. FDA’s pet food recall page, and keep the lot number and best-by date from the bag if you ever need to report a problem. Occasional recalls do not mean a food is unsafe today, but they are a reason to stay informed.
Choosing a Gentler Food
If your vet suggests changing food, they may recommend a limited-ingredient or veterinary gastrointestinal diet. See our guides to what adult cats eat and the best cat pouch foods, or choosing food for kittens if your cat is young.
Bottom Line
Blue Buffalo can be linked to diarrhea in a cat the same way any new food can, usually because of a fast switch or a poor match for that cat. Transition slowly, watch for patterns, and see your veterinarian if the problem lasts more than a day or two or comes with other symptoms.
