My daughter is gone on holidays and our dog hasn't eaten since she went. They are very close. How can I get him to eat his food?

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I do not know how long this has been going on with your dog but do not let it go on too long without consulting your vet.

Try the tastiest canned dog food 

Try hamburger meat, first uncooked, then cooked

Try chicken from KFC

Try just gravy or milk

Call your vet 

Our dog did the same thing. They call it separation disorder. The dog will need lots and lots of cuddling. Try placing a garment belonging to your daughter with her scent on it near the dog.

We leave our dog in a kennel when we go on vacation The owner said that it's quite common for dogs to go off their food for a while. IIf they aren't eating after a couple of days, "out comes the chicken". Maybe it;ll work..

But re-read Ancient One's answer. It's excellent.