Puppy won't eat old food. Can I instantly switch to new puppy food?

Question

I recently got a new dog food (Wellness CORE Grain-Free Puppy Food) for my 9 week old St. Bernard puppy because she didn't seem to like her old food (Nature's Domain Puppy Formula). I read it's good to gradually switch food with an increasing percentage of new food every couple of days. But if she is refusing to eat, is it okay to instantly switch her to her new food if she will eat all of that? Pet's info: Dog | Saint Bernard | Female | unspayed | 2 months and 2 days old | 13 lbs

Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH · Accepted Answer

The problem with changing foods too quickly is that dogs can get GI upset (especially diarrhea) with a sudden diet change. If a dog is not eating the old food anymore, sometimes we will use a bland diet (1/2 cooked white rice and 1/2 cooked white meat chicken without any skin or bones) as the other food to mix with the new food to allow for a gradual diet change to the new food to (hopefully) prevent any GI upset, so you might consider that option. Good luck! I hope that was helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.

Puppy won't eat old food. Can I instantly switch to new puppy food?

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