[header] How to sue for veterinary malpractice [title] Preserve the animal's remains. [step] If the animal died, then preserve it. Take it to a second vet, which can perform an animal autopsy (called a " necropsy "). 
The purpose of the necropsy is to find out what killed the animal. [substeps] If you are too emotional, then call a friend and have him or her help you.