Please help…… My dog won't eat?

I have a 4 1/2 month old male Shih tzu named Conner and he didn't want to eat this morning. He is teething so could it be from that?

I've been feeding him Bil-Jac (which is what the breeder had him eating and she told us to keep feeding him that until August). The Vet wants us to gradually switch him over to Science Diet so we've been feeding Conner a mixture of Bil-Jac and the Science Diet. He seems to like the Science Diet more than the Bil-Jac. This morning when I tried to feed Conner he just sniffed at the food and then walked away.

He's also been scratching at his nose, mouth, and face alot (I noticed that this morning). He'll rub his face on the carpet to scratch. He does need a haircut cause he does have alot of hair around his face (he will be getting a cut tomorrow). Could the scratching be caused by needing a haircut?

What could be the reason for not wanting to eat

Excuse margaret for being a moron. Both foods are perfectly fine, and will not harm your dog in anyway when coupled with exercise. As for the problem. She honestly may not be hungry, or may have a little bit of an upset stomach. You might wanna try feeding him a little later in the day. Some dogs do get bored of certain foods, and trust me if your dog was allergic to the food.. It wouldn't be smart enough to stop eating it.

As for the rubbing on the gruond, I'm assuming you have him on a flea protection? If not, then that would most likely be it. Otherwise, my dog does that when they get hair in their eyes, and it could be because of needing the haircut, yes.