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Switching foods without the fallout
The gradual method
- Days 1-2: mostly old. Roughly a quarter new food mixed into the usual meal.
- Days 3-4: half and half. If stools stayed normal, move to about half new.
- Days 5-6: mostly new. About three-quarters new food.
- Day 7 onwards: all new. Complete the switch if everything still looks normal.
AKC's switching guide describes this same gradual pattern over about five to seven days. Treat the pace as a dial, not a rule: dogs with sensitive stomachs, puppies, and dogs switching between very different foods (say, kibble to fresh) often do better with two weeks than one.
What to watch during the switch
The stool is your dashboard. Normal and formed: keep going on schedule. Slightly soft: hold at the current ratio for an extra day or two. Clearly loose or watery: step back to the previous ratio until it firms up, then advance more slowly. Anything from the red-flag list stops the experiment and earns a vet call. The stool log exists precisely for this week - one line per day tells you whether you're actually on track.
When the problem isn't the speed
If careful, slow transitions keep failing - several different foods, several slow ramps, same soft result - stop rotating and talk to your vet. Repeated trouble across proteins and brands points away from transition speed and toward something like a sensitivity worth investigating properly, often with a structured elimination diet rather than more guess-and-check.
Rules that save you later
Change one thing at a time: new food and new treats and a table-scrap experiment in the same week leaves you with no idea which one to blame. Buy the small bag first. And when you find a food your dog does well on, boring consistency is a feature, not a failure.