Definitely, we recommend that you make a transition from his old food. We suggest that you gradually mix the Dog Chef food into your dog's regular food over a period of 7 days.

If your dog has a very fragile digestive system, make the transition even slower: one spoon of Dog Chef on the first day and one more every day.
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If your dog has not taken the taste for Dog Chef yet, there are several reasons that can explain it: go to the article "My dog does not like/no longer likes Dog Chef meals... What to do?"