Laws, regulations, and web sources on the law of service, emotional support, and other assistance animals. Assistance animal owners in Massachusetts are not required to possess any certification or identification.Under the ADA, a service animal is defined as a dog that has been individually trained to do work or perform tasks for an individual with a disability. Service animals and emotional support animals are exceptions under Massachusetts law. Landlords cannot charge additional fees for these animals. This form should be filled out one per household with each dog's information. A dog walking contract should outline the dog walker's major responsibilities and the process for carrying those out. These Massachusetts statutes comprise the state's dog laws. Among the provisions include licensing laws, dangerous dog laws, and rabies vaccination provisions. If a tenant wishes to have a pet in a rental property, they should request and sign a Pet Addendum with the landlord before bringing the pet onto the premises.