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. A letter of instruction is a cheat sheet for anyone involved in settling your affairs.Unlike a will, this letter has no legal authority. A letter of last instruction as an essential part of their estate plans. It's not a replacement for a will, and in fact it's not even a legal document. To collect benefits, a copy of the death certificate must be sent to each insurance company. Provide the following information for each policy. This paper examines several issues related to estate planning and companion animals. What goes in a letter of instruction? Handling and closing a deceased person's bank account can help you settle the estate and prevent any fraudulent behavior from occurring.