It does sound like you are reallllllllllly set on this. You know, I'd prefer that Ellie's vet have a dog (although of course that doesn't necessarily mean the only good vets are dog owners). But I like that she can relate first-hand.
That said, I would say keep looking (you will likely need your mom to be willing to keep the pup for any good breeder to sell to you). And I'm sure it will not be easy to have one which is something that you learn after having one for awhile. There are many pre-vets that go back and forth about taking their animals to vet school b/c time and money is very limited. You won't really have any idea how much time you'll be away or studying until you are in that position. And of course you could get perfect doggie who is just so obedient and has no health problems, but we are talking Yorkies here. We have spent thousands on vet bills in the last 3.5 years, her food has to be cooked for her, and she is behaviorally...challenged. Always expect that problems will arise b/c they just might...
BTW, I think Yorkie-specific rescues are going to be more particular about placing their pups. All breed rescues may not be that picky. How about other breeds?
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