---

He should have been dewormed by the breeder at least 3 times if not 4 times before leaving them. Most breeders start deworming pups at 14 days old, because the pups get round worms from the dam's milk (even if she has been dewormed and is in excellent health ). Then the pups are dewormed every two weeks............

Call the vet, the dewormer isn't expensive and a breeder should be shot for not deworming their litter properly, considering it is such a minor expense.