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. While tenants in rent regulated or government subsidized apartments have special rights, many rules and laws apply to both unregulated and regulated apartments.This booklet explains many of these laws you need to know and provides resources where you can find more information about landlord and tenant issues. The letter is not legally binding, and the friend or relative is not obligated to carry out the instructions of the pet owner. What goes in a letter of instruction? In one corner of F. Nash, salutaforian.