What is an ESA letter? What it can and cannot do in 2026

What is an ESA letter?

An emotional support animal letter is clinical documentation. A licensed mental health professional evaluates you, concludes that you have a mental or emotional disability and that an animal relieves one or more of its effects, and puts that finding in writing. The letter is about you and your need, not about the animal's skills.

An emotional support animal can be a dog, a cat or another common household animal, and it needs no special training. It helps through its presence and the routine of caring for it. That is the key difference from a service dog, which is individually trained to perform tasks, and it is why the two are treated differently under federal law.

What does a valid ESA letter include?

Most housing providers and state agencies look for the same core details. The letter should let someone confirm who wrote it and that the writer was licensed to do so, without revealing your private health history.

Some states add their own requirements. California requires the license effective date and a 30 day client relationship before documentation for an emotional support dog, and Iowa asks the clinician to state whether a 30 day relationship existed. You can see how these details fit together on our sample letter page.

• The clinician's name, credentials and signature
• License number, license type and issuing state
• The date of the letter
• A statement of disability related need, without naming a diagnosis
• The animal or animals covered
• Contact information so a housing provider can verify the letter

What can an ESA letter do for housing in 2026?

An ESA letter supports a request for a reasonable accommodation, such as living with your animal in a building with a no pets rule. For years HUD guidance treated untrained ESAs much like trained assistance animals. That changed on May 22, 2026, when HUD told its fair housing office to find reasonable cause only where an animal is individually trained to do work or perform tasks.

The memo changed how HUD enforces the law, not the law itself. The Fair Housing Act and HUD's regulation at 24 CFR 100.204 are unchanged, private lawsuits are still available within two years, and the memo does not address Section 504 complaints involving federally funded housing and colleges. California, Massachusetts, South Carolina and Maryland agencies have said their state laws still protect untrained ESAs, and Colorado's HB26-1045 presumes that permitting an ESA is a reasonable accommodation.

In practice, the letter remains the document that state agencies, college disability offices, courts and many landlords rely on. Our guide to HUD's 2026 guidance covers the details, and our housing support page explains how we help when a provider has questions.

What an ESA letter cannot do

A letter is useful in a narrow set of situations. Outside housing, federal law gives ESAs few special rights, and no letter changes that.

Can a landlord still say no?

Yes, in some situations. Even before 2026, a housing provider could deny an animal that posed a direct threat to others, would cause substantial damage, or created an undue burden. The Fair Housing Act also exempts some small owner occupied buildings and certain single family homes rented without a broker.

After HUD's memo, a request for an untrained ESA is no longer presumed reasonable at the federal level, so the outcome depends more on your state's law and on how clearly your documentation shows the need. A letter that names a licensed clinician in your state and responds to the provider's reasonable questions puts you in the strongest position.

How long is an ESA letter good for?

Federal law sets no expiration date, but many housing providers ask for documentation dated within the past year. Some states write timing into law. Iowa treats a written finding as valid for 12 months or the lease term, whichever is longer, and Arkansas requires a yearly clinical evaluation for emotional support dog documentation.

If your letter is more than a year old, or you are moving and signing a new lease, a renewal evaluation is usually the simplest way to keep your documentation current.

How to get an ESA letter that holds up

The letters that work best share three traits: a clinician licensed in your state, a genuine evaluation, and details a housing provider can verify. Those matter more in 2026 than at any time before, because agencies and landlords now read letters closely.

Pet ESA Service connects you with a licensed mental health professional in your state. The assessment is free, the evaluation is a one time fee starting at $89, and if the clinician does not approve your completed assessment you receive a full refund of the evaluation payment. When you are ready, take the free assessment and see whether an ESA letter fits your situation.