I'm so sorry
Poor Little Buster. I'm so sorry for your loss.
I'm amazed that the petstore is refunding your money and paying for the vet bills, but that is great. I would not want another puppy from that breeder or petstore either...that breeder has liver shunt in his lines and I wouldn't want to take that chance again.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.