Yep. My initial guess was some kind of proof that it's extremely improbable to have more than 37 of the same name and breed for whatever reason. My second guess

Yep. My initial guess was some kind of proof that it's extremely improbable to have more than 37 of the same name and breed for whatever reason. My second guess was that (in some country) it was legally required for breeders to name and register their dogs with some central agency. Both seemed somewhat plausible and more interesting than what it turned out to be.