If you are a pet parent, you'll feel better knowing you've done the planning to protect your pet after your death. Use the most recent Small Estate Affidavit (SEA) form on the Bexar County Probate Court's website.An alternative is to write a letter to a friend or relative stating that upon the death of the pet owner, the animal should be euthanized. You can leave your pet to a family member, and leave the family member money to care for the pet, or you can even go so far as to set up a pet trust. What goes in a letter of instruction? You can learn how to dispose of a dead animal or pet and report clusters of dead animals for possible disease testing.