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I am sorry to hear about this. You can sue the veterinarian for malpractice, but keep in mind that you will need an expert witness (another vet) to give an expert opinion that this vet committed malpractice and failed to meet the standard of care for the profession.
You also have a legal claim against the breeder for breach of contract. You agreed to purchase a healthy puppy, and the breeder did not provide that. Because you are keeping the dog, you can sue the breeder for the cost of the medical bills that you have had to incur due to this breach.