
Quoting
pg1067
"We"? You told us that "[your] daughter purchased [the] puppy," so what would make you think you might have any recourse for anything? Is your daughter a minor?
As for your daughter, it's not clear whether she suffered any legal wrong. You wrote that "[t]he seller presented documentation that the puppy had all of its vaccines." Is there any evidence that this documentation was false or fabricated? Did the seller give her any sort of warranty that the dog would be free from disease? If so, what were the exact words of the warranty?
I'm also going to point out that the law regards pets as property, and it may be difficult or impossible to justify spending $2,500 to "repair" a piece of property that only cost $250.