How to transition your cat’s food safely
Sudden food changes are one of the most common reasons cats vomit or have loose stool. The goal is to move gradually so gut bacteria and digestive enzymes can adapt.
The 7–10 day plan
- Days 1–2: Serve about 75% old food and 25% new food (by calories, not volume—calorie density differs).
- Days 3–4: Move to a 50/50 mix.
- Days 5–6: Serve 25% old and 75% new.
- Day 7+: If stools are normal and appetite is steady, switch fully to the new diet.
If you see soft stool or reduced appetite, hold the ratio for an extra 2–3 days before increasing the new food again.
When to call your veterinarian
- Bloody stool, repeated vomiting, or lethargy
- No food intake for more than 24 hours
- Known food allergies or chronic GI disease (your vet may suggest a slower protocol)
This article is informational only and does not replace individualized veterinary advice.