She looks very wrinkly, any more pictures? Preferably standing, or at least to where you can see her body. If your vet is guessing she's around 8 weeks, and weighs 25 lbs already, thats a big puppy. It's impossible to say what she truly is, but of course always interesting to hear what others guess. How does someone lose a puppy that young anyway, back yard breeders are idiots. She's a doll, are you keeping her?