What dog is this??

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The puppy is adorable. It can be hard to determine the breeds in a puppy. Once she gets older it will be easier. You can be certain, though, that she doesn't have fox in her. Dogs and foxes don't mate with each other.

The playful biting and stealing are normal puppy behaviors. You can find lots of helpful information about caring for and training a puppy on this forum.
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Dogs and foxes CAN'T mate with each other and produce offspring even if they wanted to. No dogfoxes here!

I see a bit of a wavy coat that tells me there might be some poodle-mix in there. A lot of -poo pups have that sort of a coat.

Puppies are virtually impossible to determine the breeds of but she looks like the

Cute. You can't really tell mixed breeds by looking unfortunately. She kind of looks like a Rott mix e maybe but who's to say. Definitely something with tri color gene. Well dogs and foxes can't interbred so that's out.

i could see a bit of terrier or badger dog (we call that type of hound "Dachshunde" in German, different breeds like the different kinds of Dachsbracken, Teckel, the Basset breeds...I don't find anything in dictionaries, because the English use "Dachshund" for Dackel/Teckel and things get confusing...they're bred to follow animals like the Badger under the ground in their burrows and either fight them there or drive them out so the hunter can kill them.)...you know a relatively small wirehaired hound.
perhaps mixed with some kind of herder.

Did the vet give you an age range? And weight? It's hard to say when they are young, but age and weight can help to narrow it down.