Service Dog Documentation: What You Actually Need, Situation by Situation

"What documentation do I need for my service dog?" is the question with the most wrong answers on the internet, because the people answering it are usually selling the documentation. The real answer is that it depends entirely on where you're going, and in the place most people worry about, the answer is none.

This page goes situation by situation. For each one: what the law says, what you'll actually be asked for, and what's worth carrying anyway.

The Whole Picture

The rest of this page explains each row.

Businesses and Public Places: Nothing

Under the ADA, a business can't require any documentation for a service dog. Not a certificate, not a registration, not an ID card, not a doctor's letter, not a demonstration. When it isn't obvious what the dog does, staff may ask two questions, whether the dog is a service animal required because of a disability and what task it's trained to perform, and that's the entire inquiry.

Part of the reason is that no official documentation exists. There is no government certification and no government registry. Any certificate or registration you can buy is a private product, and the Department of Justice says plainly that these don't convey any rights.

So why do handlers carry an ID card? Because the law and the person at the door are two different things. A card that shows the dog's name, your name, and what the ADA actually says ends most conversations in seconds. It isn't documentation. It's a shortcut. Our guide on whether you need an ID card is honest about that distinction.

Airlines: The DOT Form

Flying is the one everyday situation with real paperwork, because airplanes are governed by the Air Carrier Access Act, not the ADA. Since 2021, airlines may require:

• The DOT Service Animal Air Transportation Form for every flight. It asks you to attest to the dog's training, health, and behavior, and to confirm your rabies vaccination date. It's free from the DOT's website and most airlines let you upload it.
• The DOT Service Animal Relief Attestation Form for flights of 8 hours or more, confirming the dog can either hold it or relieve itself without a mess.
• 48 hours' notice if you booked more than 48 hours out.

Airlines may not require anything beyond the DOT forms: no vest, no ID, no vet letter for a domestic flight. Our flying guide walks through the forms line by line and lists each airline's upload process.

Housing: Sometimes a Letter

Landlords are under the Fair Housing Act, and the rules are different from the ADA in two ways. First, the Fair Housing Act covers emotional support animals as well as service dogs. Second, when your disability and your need for the animal aren't obvious, a housing provider may ask for reliable documentation: typically a letter from a doctor, therapist, or other health professional confirming that you have a disability and that the animal helps with it.

What they can't do:

• Ask for the diagnosis or your medical records
• Require a specific form, a "certification," or a registry number
• Charge a pet fee, pet deposit, or pet rent for an assistance animal
• Apply breed or weight limits to an assistance animal
• Ask for documentation when the disability is obvious, such as a guide dog with a person who is blind

HUD has warned specifically about websites that sell letters without any real relationship with the person. A letter from a provider who has actually treated you carries weight. A $49 letter from a site you found yesterday often doesn't, and some landlords now challenge them.

Work: Treat It Like Any Accommodation

Bringing a service dog to work is a reasonable accommodation request under the employment part of the ADA, and employers handle it the way they'd handle a request for a modified schedule or special equipment. That means your employer may ask for documentation that you have a disability and that the dog is needed, usually a letter from a health professional, and may ask how the dog will behave in the workplace.

What helps here is a short written summary: what the dog is trained to do, how it's handled during the day, where it relieves itself, and that it's housebroken and under control. Employers say yes faster when the plan is already written.

School and Campus

For public areas of a college or university, the ADA rule applies: no documentation, two questions. Campus housing follows the Fair Housing Act, so the housing office may ask for a provider's letter when the disability isn't obvious. Most schools ask students to register with the disability services office, which is about coordinating accommodations, not about proving the dog. K-12 public schools follow the ADA for service dogs too, though they can ask about the dog's handling plan during the school day.

Hotels, Short-Term Rentals, Rideshare, and Trains

• Hotels are businesses under the ADA. No documentation, no pet fee.
• Airbnb and Vrbo both require hosts to accept service animals, with narrow exceptions for shared-space listings and a documented health or safety issue. No paperwork required; you can mention the dog in your booking message.
• Uber and Lyft drivers must accept service dogs, no questions beyond the ADA's two. No documentation. Both companies remove drivers who refuse.
• Amtrak and Greyhound follow the ADA. No documentation; staff may ask the two questions.

International Travel: Real Paperwork, for the Dog's Health

Crossing a border is the one place where the documentation is substantial, and it's about the dog's health, not its status. Most countries require some combination of:

• A veterinary health certificate issued within a set number of days before travel, often endorsed by USDA APHIS
• Proof of rabies vaccination, sometimes with a blood titer test months in advance
• An ISO microchip
• An import permit, and for some countries a tapeworm treatment or quarantine

Returning to the U.S. has its own rules, including a CDC dog import form. Our country-by-country guide covers Canada, the UK, the EU, Japan, Australia, and Mexico.

The "Service Dog Letter"

A lot of searches for documentation are really about this. A service dog letter, sometimes called a PSD letter, is a letter from a health professional stating that you have a disability and that a dog is part of your treatment. Here's where it does and doesn't matter:

• Public places: irrelevant. A business can't ask for it and shouldn't be shown it.
• Airlines: irrelevant since 2021. The DOT form replaced it.
• Housing: this is where it's used, when the disability isn't obvious.
• Work: this is the other place it's used.

Get it from someone who actually treats you. The letter mills exist because the housing and work uses are real, but a letter from a provider who has never met you is the version landlords have learned to question.

What's Worth Keeping in a Folder

None of this is required for walking into a store. All of it has come in handy for someone:

1. Completed DOT forms, saved as PDFs on your phone, for the next flight
2. Your dog's vaccination records and microchip number
3. A one-page training summary: what the dog is trained to do, how long it trained, who trained it
4. A provider's letter, if you'll ever need housing or workplace accommodation
5. Your ID card, digital or physical, for the door conversations
6. A printout of the ADA service animal rule, for the rare manager who wants to read it

What Isn't Documentation

Certificates, registrations, and ID cards sold online are not documentation in any legal sense, and no agency recognizes them. That includes ours. An ID card is useful because it answers the question at the door quickly and truthfully; it has no legal effect, and anyone who tells you their card is "official" or "certified" is misleading you. The training is what makes your dog a service dog. Everything else is a convenience or a scam, and it's worth knowing which is which.

The Bottom Line

For everyday life, you need nothing. For flying, you need the DOT form. For housing and work, you may need a letter from someone who treats you. For travel abroad, you need vet paperwork for the dog. Keep those four things straight and you'll never be caught without what's actually required, or talked into buying what isn't.