Mine did that too--only eating the new food. So last time when I transitioned them to NB Duck & Potatoes, I only added 1/4 of the new food. So after they finished picking out the new food, they stopped eating. But because they were still hungry, they went back to the bowl and continued to eat the old food. It takes me about 5-6 days to transition but I just didn't want them to have tummy ache or diarrhea.
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