An assistance animal is an animal that does work, performs tasks, or provides therapeutic or emotional support for a person with a disability. The category is broader than "service animal" as defined in other laws: in the housing context it includes emotional support animals, and under fair-housing law an assistance animal is generally not considered a pet. That distinction has practical consequences — pet restrictions, pet fees, and pet deposits generally cannot be applied to an assistance animal when the request qualifies, though the tenant remains responsible for the animal's behavior and for any damage it causes.
Requests to keep an assistance animal are handled as reasonable-accommodation requests: consider them individually and in good faith. When the disability or the animal's role is not apparent, a housing provider may generally request reliable documentation of the disability-related need, but there are limits on what can be asked, and blanket demands or reflexive denials create risk. Breed, size, or species concerns are evaluated case by case rather than by categorical rules. The specifics depend on circumstances and jurisdiction — this is education, not legal advice, and a fair-housing attorney is the right resource for hard cases.
This is general educational information, not legal or tax advice. Rules vary by state and locality and change over time — check your local law and confirm specifics with a qualified professional.