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Nutrition guide

Changing pet food safely: the seven-day transition

A gradual change can be easier on the gut. Use this seven-day example, know when to slow down, and ask your vet for a longer plan when health conditions are involved.

Even a good food can be a difficult change when it arrives all at once. The World Small Animal Veterinary Association recommends a slow transition for healthy pets—at least three days, and longer when a pet has disease or a sensitive history. A seven-day plan is a simple starting point for many healthy dogs and cats, but it should flex around the individual.

The seven-day idea

Mix the current and new foods rather than serving two completely separate meals. Begin with a small amount of new food, increase it in stages, and finish only when your pet is comfortable. The diagram above shows one common pattern: 25%, 50%, 75%, then 100% new food.

Example transition plan
Days New food Current food What to watch
1–2 25% 75% Appetite and stool quality
3–4 50% 50% Comfort with the new texture
5–6 75% 25% Energy and digestion
7 100% 0% Continue monitoring body condition

Keep the numbers honest

Different foods can have very different calorie densities. A scoop that looks the same may not provide the same energy. Use the new food’s feeding guidance as a starting point, measure the daily amount, and keep treats consistent while you observe appetite, stools, energy, and body condition.

When to slow down

  • If stools become softer, hold the current mix for another day or return to the previous comfortable step.
  • If your pet refuses food, vomits, has diarrhoea, seems painful, or becomes unusually quiet, stop treating this as a normal transition and contact your veterinary team.
  • Pets with a diagnosed condition, a history of food intolerance, or a therapeutic diet may need a veterinary transition plan.

Petwell note: “Gradual” is the principle. Seven days is a useful visual plan, not a promise that every pet will follow the same calendar.

Sources & further reading

  1. WSAVA: Frequently Asked Questions and Myths about pet nutrition
  2. WSAVA: Global Nutrition Guidelines