A pet addendum should include a "Violation" clause if the tenant or the animal breaches the terms of the new agreement. Use a pet addendum to formally ask for a monthly pet fee in addition to a security deposit.Some questions I have and would appreciate feedback around. The Pet shall not cause any discomfort, annoyance, or nuisance to any other resident. The Pet Rent shall be payable in the same manner as. Rent and shall be considered rent under the Tenant's apartment lease. A pet addendum does exactly that it's designed to address both parties' rights and responsibilities regarding pets in a rental property. Any Tenant who has a pet or who has family members or guests with a pet, shall fill out and return to XXXXXX'X with their lease, the enclosed Pet Agreement. A pet addendum is a legal document that outlines a landlord's terms and conditions on having pets, ESA, and service animals on the property. The pet security deposit may not be processed from the Rental Office for up to forty-five (45) days after Resident has vacated the apartment.