oh, it's not just mine!
Sometimes he's a dog. Sometimes he's a cat, or truck, or zookeeper, or dinosaur, or tiger, frog, fish.... well, you pretty much name it.
I don't like it when he wants to eat like a dog (etc). I have to say though, that giving him instructions 'in character' is actually so much more effective than asking him to do things. Doggy (or monkey/cat/digger/whatever) is often much more helpful and obliging than DS... And naughty monkey likes to steal food of 'our' plates, so there are some meals where that's teh only way he'll eat.
They grow out of this, right?