How to switch dog food: a measured transition log

Compare the two feeding guides before mixing

Write down the old and new foods’ daily feeding amounts, calories per 100 g, life-stage or feeding-purpose statement, and any transition directions printed by the manufacturer. A dog that receives 100 g of the old food may not need 100 g of the new food because their energy densities can differ.

Calculate each portion from that product’s own daily amount. If the old guide says 100 g and the new guide says 80 g, a 50:50 day means 50 g of the old food plus 40 g of the new food. Weighing in grams is more reproducible than comparing cups or kibble counts.

Use a schedule as a starting point, not a promise

WSAVA advises a slow transition over at least several days for a healthy pet, with longer transitions for animals with disease. Veterinary sources also publish stepwise examples, but there is no single timetable that fits every dog. A practical seven-day log can use 25% new food for days 1–2, 50% for days 3–4, 75% for days 5–6, and the new food’s full daily amount from day 7.

The percentages describe each food’s own target daily amount. Pause before the next step if appetite or stool changes. A therapeutic diet, elimination trial, growing puppy, pregnant or nursing dog, or dog under treatment needs instructions from the veterinarian or manufacturer that take priority over a general schedule.

Record every edible item

For each day, note grams offered and left, stool frequency and form, vomiting, appetite, energy and any marked change in drinking. Add treats, toppers, table food, supplements and food used to give medication. This creates a timeline a veterinarian can use; it does not prove that one ingredient caused a symptom.

Avoid starting several new foods or treats in the same week. When multiple items change together, even a detailed ingredient list cannot isolate the reason for a reaction. Keep the product bag and photograph the product name, best-before date and lot number.

Know when to stop the home experiment

Repeated vomiting, obvious blood, black stool, marked lethargy, inability to keep water down or signs of significant pain require veterinary contact rather than another change in mixing ratio. Puppies, senior dogs and dogs with chronic disease can deteriorate more quickly, so seek advice early.

Mild digestive changes also deserve follow-up when they persist or recur. Do not add human medicines, fasting or supplements without veterinary guidance. A food transition is a feeding task, not a diagnostic test.

References

This guide was checked against the WSAVA Global Nutrition Committee FAQ, Cornell University College of Veterinary Medicine guidance on re-evaluating a dog’s diet, and the UC Davis Veterinary Medicine Nutrition Support Service FAQ. The current package and the veterinarian responsible for an individual dog remain the controlling sources.