In reply to drunken monkey:
Your vets have agreed to pursue the bill with the fella. Legally, I suspect that by doing this, they have effectively taken on the debt, and it is now up to them to pursue it.
Go to police, get an incident no, as even if this does not gain you anything, it is likely to happen again to someone else, and it will remain on file.
Otherwise, small claims court. Issue matey (if he fails to pay the vet and you do,) with a letter, with delivery recorded, saying that you are pursing the debt and will commence legal proceedings via small claims court as of...(give him 28 days); ensure that you word it such that it reads more like an opportunity for him to pay up (plus expenses etc) now in full, but court will occur unless the bills are paid in full. Keep all copies, including those of bills. Then go for it.
I can understand your reluctance to use your own doggie insurance...by the time exclusions are added, the excess, loss of NCB.... it's not worth it unless the doglet has cost you thousands.
Sx