Switching Your Pet to a New Food, Without the Tummy Trouble
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Found a food your pet will love? Great choice. But before you fill the bowl, know this: a sudden switch is the most common cause of upset stomachs in both dogs and cats. Their digestive systems adapt to what they eat every day, and an overnight change can mean gas, loose stool, or a pet that simply refuses the new bowl.
The 7-day transition
Mix the new food into the old gradually:
- Days 1–2: 25% new food, 75% current food
- Days 3–4: 50/50
- Days 5–6: 75% new, 25% current
- Day 7: 100% new food
If stools go soft at any stage, hold that ratio for an extra day or two before moving on. Cats can be extra opinionated; for a picky eater, stretch the whole transition to two weeks.
Signs the new food suits them
After two to three weeks, look for steady energy, a shiny coat, firm stool, and consistent appetite. Those are the everyday signals that a food agrees with your pet.
When to ask a vet
Vomiting, refusal to eat for more than a day (especially cats), or diarrhea lasting more than 48 hours are reasons to check in with your veterinarian rather than push through the transition.