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My dog refuses to eat. I've tried to give him another food, but the results were not great. Has someone faced such a problem?

My dog also had problems with eating. Sometimes he can eat 3-4 times a day, and sometimes once or can be hungry all day. And I don't know what the reason is, because the vet said he is healthy. The situation improved a little when I started buying hypoallergenic dog food, and maybe you should also try to change the food you give to your dog? I don't know if it helps, but it's worth trying, I think.