Which Animals Can Be an ESA, and How Many Can You Have?

Federal housing law does not contain a species list. The Fair Housing Act never mentions animals at all — it requires a housing provider to make reasonable accommodations in rules, policies, practices, or services, and HUD’s regulation at 24 C.F.R. § 100.204 illustrates that duty with a seeing eye dog and a reserved parking space. Everything people believe about which animals are “allowed” comes from somewhere else, and usually from a statute that governs a different setting entirely.

Sorting out where each rule applies answers both halves of the question.

Species: three different federal rules, three different answers

Setting	Governing rule	Species allowed
Your home	Fair Housing Act, 42 U.S.C. § 3604(f)(3)(B)	No species named in the statute
Stores, restaurants, hotels	28 C.F.R. §§ 35.104, 36.104	Dogs only, plus trained miniature horses
Airplane cabin	14 C.F.R. § 382.3	Dogs only

The ADA regulation is blunt about it: a service animal is “any dog that is individually trained to do work or perform tasks,” and “other species of animals, whether wild or domestic, trained or untrained, are not service animals for the purposes of this definition.” Miniature horses get a separate provision at 28 C.F.R. § 36.302(c)(9), which lets a business assess four things — the animal’s type, size, and weight; whether the handler has sufficient control; whether it is housebroken; and whether its presence compromises legitimate safety requirements.

Air travel is narrower still. The Department of Transportation’s definition at 14 C.F.R. § 382.3 covers dogs and states that emotional support animals, comfort animals, companionship animals, and service animals in training are not service animals for that part.

Housing is the outlier, and it is the outlier in the direction renters care about.

The federal guidance on species was withdrawn

FHEO Notice 2020-01, the January 2020 assistance animal guidance, no longer stands. HUD’s fair housing office withdrew it — and the 2013 notice it had replaced — as of September 17, 2025, in a notice appearing at 91 FR 17291.

The withdrawn notice was where the familiar sorting of “common household animals” against unusual species lived. With it gone, there is no federal guidance document setting out how a housing provider should treat a request for a rabbit rather than a dog.

Two federal pieces did survive, because they are regulations rather than guidance:

• The accommodation duty. 24 C.F.R. § 100.204 requires reasonable accommodations in rules, policies, practices, or services where necessary to afford a person with a handicap equal opportunity to use and enjoy a dwelling. Nothing in it limits the animal to any species.
• HUD-assisted housing. 24 C.F.R. § 5.303 provides that HUD’s pet rules “do not apply to animals that are used to assist, support, or provide service to persons with disabilities,” and that project owners and public housing agencies “may not apply or enforce any policies established under this subpart” against them.

Where a species question needs a clear answer today, the reliable source is a state statute rather than a federal notice.

The species that actually work in practice

Dogs and cats dominate real requests, and they do so for boring, practical reasons: local ordinances permit them, veterinary care is routine, landlords understand them, and neither needs a habitat that alters the unit. Rabbits, small birds, guinea pigs, hamsters, and rats appear regularly and rarely cause a fight.

Things get harder as you move outward, and the obstacles usually are not fair housing law at all:

• Local animal-control ordinances. Cities and counties routinely ban or license particular species, and fair housing law does not override an ordinance that applies to everyone in town.
• Habitat requirements. An animal that needs a tank, an enclosure, or a heat lamp raises legitimate questions about property alteration and fire safety.
• Damage and nuisance risk. A landlord may deny an accommodation where the animal poses a direct threat or a threat of substantial property damage that no other accommodation can address.

Florida’s statute puts the practical filter in writing. Fla. Stat. § 760.27 lets a housing provider require proof of compliance with state and local licensing and vaccination requirements, which quietly resolves most exotic-animal requests without anyone arguing about disability at all. The Florida ESA rules cover the rest of that statute’s request-and-response framework.

How many animals: no cap, but no free pass either

There is no number in the Fair Housing Act, and no number in HUD’s regulations. What replaces a number is a simple principle: each animal has to be justified on its own.

That is the point where multi-animal requests usually collapse. A letter that says “the tenant benefits from her animals” covers no animal specifically. A letter that explains what the second animal does that the first does not is a different document.

State law shows the same logic from two directions:

• Florida authorizes a housing provider to request information about the specific need for each animal when a tenant asks to keep more than one, under Fla. Stat. § 760.27.
• California runs it the other way: a landlord cannot cap a household at a single animal when more than one has a documented disability-related need. See the California ESA guide for how FEHA and Cal. Health & Safety Code § 122318 interact.

HUD’s 2026 memo pointed at the failure mode directly, noting that its appendix included “two examples of meritless cases involving multiple emotional support animals that FHEO recently dismissed.” Whatever you make of the policy shift, that is a useful signal about which requests get taken seriously.

What a housing provider may legitimately ask about the animal

A provider assessing a species or a count is not entitled to your medical history, and several states say so in statute. Florida’s § 760.27(3) bars a housing provider from requesting information that discloses the diagnosis or the severity of a disability, or any medical records, and bars requiring a specific form or a notarized statement. What a provider can ask about is the animal: what it is, whether local licensing and vaccination rules are met, and — where more than one animal is requested — what each one does.

That distinction is worth rehearsing before the conversation, because tenants often answer the wrong question. “She helps with my panic attacks and he wakes me from nightmares” answers the animal question for two animals. “I have been diagnosed with two conditions” answers a question nobody is allowed to ask.

Reality checks that apply to every species and number

Size is not a species argument. A landlord cannot apply a weight cap or a breed list to an approved assistance animal, but a genuinely oversized animal in a very small unit can raise an undue-burden question that a Chihuahua never will.

Numbers interact with local law. Many municipalities limit how many animals a household may keep. New York City renters have an unrelated but useful protection in N.Y.C. Admin. Code § 27-2009.1, the three-month open and notorious pet rule described in the New York ESA guide.

No credential fixes any of this. No agency issues an ESA registry entry, an identification card, or a certificate with legal force, and buying one for each of three animals simply triples the amount of paper that means nothing. Florida legislated the point at § 760.27(3)(c), which says an identification card, patch, certificate, or similar registration obtained from the internet is not by itself sufficient information. Texas reaches the same place through Tex. Hum. Res. Code § 121.002, which defines assistance and service animals as specially trained canines — see the Texas ESA guide.

Damage liability follows every animal. The rule against pet deposits has never been a rule against paying for harm. A tenant remains responsible for what any animal actually damages, and with three animals that exposure is simply larger.

Before you ask for a second animal

Ask a licensed provider to address each animal separately, in its own sentences, tied to a distinct symptom or function. Check your city’s animal-control ordinance before you check your lease. Confirm licensing and vaccination for every animal in the household. And keep the request in writing, so that if the answer is no, you know which animal was refused and why. The related mechanics of a denial are covered in can a landlord deny an emotional support animal, and the underlying housing framework in ESA housing rights under the Fair Housing Act.