Any licensed mental health professional can write an emotional support animal (ESA) letter. That includes psychiatrists, psychologists, licensed clinical social workers (LCSWs), and licensed therapists or counselors. Under the Fair Housing Act, primary care physicians also qualify, though mental health professionals are the most common choice because the letter must connect a mental health disability to the need for the animal.
Which Professionals Qualify
The Fair Housing Act language is broad: housing providers can require “reasonable supporting documentation from a physician, psychiatrist, or a licensed healthcare professional.” In practice, the professionals who most commonly write ESA letters are:
- Psychiatrists, who can both diagnose mental health conditions and prescribe medication
- Psychologists, who provide therapy and psychological testing but don’t prescribe medication in most states
- Licensed clinical social workers (LCSWs), who can diagnose mental health conditions and provide therapy
- Licensed professional counselors and therapists, including marriage and family therapists
- Primary care physicians, who qualify under the FHA’s broader “physician” language
The key requirement isn’t the specific title. It’s that the professional holds a valid, active license in the state where you live and has personally evaluated your condition. A provider licensed only in another state cannot write your letter.
What the Letter Needs to Say
A valid ESA letter does more than confirm you have an animal. It needs to establish three things: that you have a recognized mental health condition, that this condition substantially limits a major life activity, and that the animal provides emotional support that alleviates specific effects of that condition. “Substantially limits a major life activity” is the legal threshold. It means your condition meaningfully interferes with things like sleeping, concentrating, working, or maintaining social relationships.
Court cases have clarified what landlords can reasonably expect to see. In one appeals case, the court found that a housing provider could ask for the nature of the mental or physical impairment, a statement that the provider conducted an appropriate clinical evaluation, and a copy of the provider’s license. The letter should be on professional letterhead and include the provider’s license number, license type, jurisdiction, and the date the letter was issued.
The American Psychiatric Association recommends that ESA letters be reviewed and updated every six months.
The Provider Relationship Matters
A letter from someone who has never properly evaluated you is unlikely to hold up. HUD Secretary Ben Carson warned the Federal Trade Commission in 2019 that certain websites were selling ESA documentation based on nothing more than an online questionnaire or a brief phone call, calling that kind of interaction “insufficient to reliably verify a person’s need for an accommodation.”
Several states have gone further and written minimum relationship requirements into law. California, Montana, Arkansas, Louisiana, and Iowa all require at least a 30-day client-provider relationship before a practitioner can issue ESA documentation. California’s law, which took effect in January 2022, specifically requires the provider to complete a clinical evaluation of the individual’s need for the animal, not just rubber-stamp a request.
Even in states without a formal waiting period, a housing provider is more likely to accept a letter from someone who has an established treatment relationship with you. If you’re already seeing a therapist, psychiatrist, or counselor, that person is your strongest option.
Telehealth Letters Can Be Valid
You don’t necessarily need an in-person appointment. ESA letters obtained through telehealth consultations are legally valid, as long as the provider is licensed in your state and conducts a real evaluation via live video or phone call. The distinction is between a genuine clinical consultation and a website that just has you fill out a form and generates a letter automatically.
Red flags for illegitimate services include guaranteed approval, instant letters with no consultation, and no connection to a specific licensed provider in your state. If a website skips the live evaluation step entirely, the letter it produces has no legal weight. Housing providers are not obligated to accept documentation from services that operate this way.
If you use a telehealth service and live in one of the five states requiring a 30-day relationship, make sure the provider schedules at least two sessions over that period. Otherwise, the letter will be invalid under your state’s law regardless of how thorough the evaluation seemed.
ESA Letters No Longer Apply to Air Travel
A common misconception is that an ESA letter grants your animal access to airplane cabins. That changed in January 2021, when the U.S. Department of Transportation issued a final rule redefining service animals as dogs individually trained to perform specific tasks for a person with a disability. The rule explicitly excludes emotional support animals from the service animal definition and allows airlines to treat them as pets. This means airlines can charge pet fees, require a carrier, or refuse to let your ESA in the cabin altogether.
An ESA letter still provides housing protections under the Fair Housing Act. Landlords who have no-pet policies or charge pet deposits are generally required to make a reasonable accommodation for an emotional support animal when you provide valid documentation. They cannot charge extra pet rent or deposits for an approved ESA. But the letter’s usefulness is now limited to housing. It won’t help you at airports, in restaurants, or in other public spaces where service animal rules apply.
What Doesn’t Count as a Valid Letter
Online “ESA registries” and certificates purchased from websites have no legal standing. There is no official national or state registry for emotional support animals. A certificate with your pet’s photo, a registration number, or an official-looking badge means nothing to a landlord or housing authority. HUD has specifically warned consumers that these products “have no legal force of any kind.”
Similarly, a letter from a provider who has no clinical knowledge of your situation is unreliable. Housing providers are within their rights to scrutinize documentation, and a letter that lacks a license number, doesn’t identify a specific disability-related need, or comes from a provider in a different state gives them grounds to deny your request. The safest path is straightforward: get your letter from a licensed professional who knows your mental health history and can speak specifically to how the animal helps you.