Last updated: 24 August 2026
Short answer: usually, but it is not the actual requirement — and the difference matters enormously if you are one of the people the exceptions were written for.
Almost every page on this subject states a flat rule: service dogs must be leashed. That’s close enough to be useful for most teams and wrong in a way that costs the handlers who most need to know better.
Here is the regulation, and then eight worked examples of when it doesn’t apply.
What the regulation actually says
28 CFR 35.136(d), in full:
“A service animal shall be under the control of its handler. A service animal shall have a harness, leash, or other tether, unless either the handler is unable because of a disability to use a harness, leash, or other tether, or the use of a harness, leash, or other tether would interfere with the service animal’s safe, effective performance of work or tasks, in which case the service animal must be otherwise under the handler’s control.”
Read the order of those two sentences, because it’s the whole thing.
Sentence one is the requirement: control. Sentence two is the default method for achieving it. A leash is how most teams satisfy the rule — it is not the rule.
Note also that “harness” counts. A rigid mobility handle is a harness. A guide dog’s harness is a harness. If your dog is in one, you have satisfied the tether requirement without a separate lead in your hand.
The two exceptions
Either one is enough on its own. You do not need both.
One: the handler cannot use one because of a disability.
Not “finds it difficult.” The regulation says unable because of a disability. No proof, no form, no letter — the standard is what your disability actually prevents.
Two: a tether would interfere with the dog’s safe, effective performance of work or tasks.
This is the broader exception and the one more people qualify for than realize. If the task requires the dog to leave you, a six-foot lead makes the task impossible.
In either case the dog must be “otherwise under the handler’s control” — voice, hand signal, or other effective means. The obligation doesn’t disappear. Only the hardware does.
Eight situations where the exception applies
Abstract rules are hard to argue at a shop door. Concrete ones aren’t.
1. The handler has no functional grip
Someone with advanced rheumatoid arthritis, a spinal cord injury affecting hand function, cerebral palsy, or an amputation without a prosthetic that can hold a lead.
This is exception one, and it is the clearest case there is. You cannot hold a leash. The regulation contemplates you.
2. Both hands are on mobility equipment
A handler using forearm crutches, a walker, or a rollator has no free hand. Adding a lead means either dropping a crutch or wrapping the lead somewhere it can pull you over.
This is also exception one — the disability is what prevents leash use, even though the hand itself works.
3. The dog retrieves from another room
A dog trained to fetch dropped medication, a phone, a cane or a wallet from where it fell cannot do that on a lead. Neither can a dog that opens a fridge and brings something back.
Exception two, plainly. The tether would make the task impossible, which is the definition.
4. The dog goes to find help
A handler on the floor after a fall or a seizure sends the dog to find a spouse, a colleague, or the nearest adult. A dog attached to an unconscious handler cannot fetch anyone.
This is the exception at its most obvious, and the situation it matters most in.
5. A rigid mobility harness is being used
A dog in a bracing or counterbalance harness is already tethered — the harness is one of the three things the regulation names. A separate lead in the other hand is optional, and for a handler who needs that hand free, it’s a hazard.
More on the equipment in what mobility service dogs do.
6. The dog searches a room ahead of the handler
A PTSD service dog trained to enter and check a space before its handler cannot do it on a six-foot lead — the handler would be in the room already, which defeats the point.
Covered further in what PTSD service dogs do.
7. The dog blocks or circles in a crowd
A dog trained to create physical space around a handler needs to move relative to that handler. A fixed-length lead prevents exactly the movement the task requires.
8. A lead would be dangerous in the equipment
A lead near wheelchair wheels, an escalator, or a power chair’s drive wheels is a genuine hazard. A tether that could pull the dog into moving equipment is not making anyone safer.
One honest note about that last one: this is the least clear-cut of the eight. The regulation asks whether the tether interferes with the dog’s work, not simply whether it’s inconvenient — so a hands-free lead clipped to the chair frame may be a better answer than no lead at all.
What “otherwise under the handler’s control” means
The exception removes the leash. It does not remove the standard.
Your dog must still be doing what you ask, when you ask, in an environment full of distraction — and you must be able to demonstrate that if anyone watches.
In practice that means:
- A recall that works the first time, in a shop, with food on the floor
- A stop or a down at distance, on voice or hand signal
- A dog that stays in position without being reminded every few seconds
- Ignoring people, dogs, trolleys and dropped food without your intervention
If your dog is off-lead because your task requires it, the dog will be watched more closely, not less. Every observer is deciding whether this is a working dog or a loose pet. The behavior has to answer that before anyone asks.
And the removal grounds still apply. A dog that is out of control and not brought back under control can be excluded — leash or no leash. That’s 28 CFR 35.136 too.
Local leash laws don’t override the exception
This is the argument that actually happens, usually with animal control rather than a shop.
Almost every town has a leash ordinance. It applies to pet dogs.
It does not defeat a federal exception for a service dog whose handler qualifies for one. Under 42 U.S.C. § 12201(b), state and local law survives only where it gives greater or equal protection to people with disabilities. A local rule that restricts you further offers less protection, so it does not override the ADA.
That doesn’t mean the officer in front of you knows it. Being right and being treated as right are different things. Carrying a printed copy of 28 CFR 35.136(d) is more useful than reciting it from memory, and what to do if you’re denied access covers the wider situation.
The exceptions do not follow you onto an aircraft
This catches people out and I have not seen it written down anywhere else.
Air travel is not covered by the ADA. It runs under the Air Carrier Access Act, and the Department of Transportation’s service animal rule says something different.
“You may require that a service animal be harnessed, leashed, or otherwise tethered at all times by the service animal user or service animal handler while in areas of the airport that you own, lease or control, or on an aircraft.”
Read what isn’t in there. No exception for a handler unable to use a tether because of a disability. No exception for a tether interfering with the dog’s work. The airline may require physical restraint at all times, in the terminal areas it controls and on the aircraft, full stop.
So a team that works off-lead perfectly lawfully in a supermarket can be required to tether at the gate. If that’s you, sort it out before you fly — a hands-free lead clipped to a belt or a chair satisfies the rule without needing a hand, and finding that out at the boarding door is the worst possible moment.
The same rule sets out what “under control” looks like in the air: the animal “does not run freely around an aircraft or an airport gate area, bark or growl repeatedly… bite, jump on, or cause injury to people, or urinate or defecate in the cabin or gate area.”
Getting to off-lead reliability, if you need it
If your task genuinely requires the dog to work untethered, that reliability has to be built deliberately. It doesn’t arrive with the vest.
Build it in this order:
- At home, no distractions. Recall, stop, down at distance, position holds — until they’re boring
- A fenced outdoor space. Same skills, more smells, still contained
- Quiet public places on a long line, so a failed recall has no consequences
- Busy places on a long line, still contained
- Off-lead in low-stakes public spaces where a mistake costs nothing
- Off-lead where the task actually happens
Do not skip the long line. It’s the whole safety net. A dog that has never failed a recall has never been proofed against failing one.
And be honest about the standard. If your dog recalls nine times out of ten, it is not ready to work off-lead in a shop. The tenth time is the one everyone sees.
A dog in training should be leashed, always. Public access rights for a dog still learning are a separate and much thornier question — can service dogs in training go anywhere covers it — but whatever your state permits, an untrained dog off-lead in public is how teams and reputations get damaged.
One rule with no exceptions: never tie your service dog to anything. Not a post, not a table leg, not a trolley, not a bench. The lead stays in your hand or attached to you. A tethered dog cannot escape a hazard, cannot work, and can be taken. Programs teach this on day one and it’s worth stating plainly.
If you’re challenged over the leash
The two questions haven’t changed. Staff may ask whether the dog is required because of a disability, and what work or task it has been trained to perform. That’s the whole permitted inquiry.
You do not have to explain your disability, including when the exception you’re relying on is the disability one. “I’m unable to use a leash because of my disability” is a complete answer. You are not obliged to say why.
A useful sentence that covers the ground without a lecture:
“He’s a service dog. He’s trained to retrieve items I drop, which he can’t do on a lead — federal regulations allow that. He’s under voice control.”
And carry the regulation. One printed paragraph settles more arguments than any amount of confidence.
The equipment question, since most teams do use a lead
Most handlers are leashed most of the time, and the gear matters more than people expect.
A fixed-length lead, four to six feet. Long enough that the dog isn’t dragged, short enough that you always know where it is.
Hands-free options are legitimate. A lead clipped to a belt, a waist lead, or a lead attached to a wheelchair frame all keep the dog tethered while leaving your hands free. If your disability makes gripping hard but not impossible, this is often a better answer than claiming an exception.
A harness with a handle gives you close control in tight spaces without a separate lead.
Retractable leads: don’t
This is the one piece of equipment worth being blunt about.
- No precise control. The whole point is variable distance, which is the opposite of what public access work needs
- The lock fails and the handle gets dropped, and a dog that learns the lead can suddenly go slack learns the wrong lesson
- The cord causes injuries — friction burns and worse, to handlers, dogs and bystanders
- It reads as a pet. A retractable lead undercuts your team’s credibility before the dog does anything
Whatever the law permits, a retractable lead is a poor tool for a working dog. If you’re using one because grip strength is the problem, a hands-free waist lead solves it better.
One more thing that isn’t about equipment. Some handlers keep their dog leashed well past what the law requires, for reasons that have nothing to do with control — a large or broad-headed dog draws different assumptions off-lead than on. That’s a real calculation and it’s covered honestly in ADA service dog laws.
Frequently asked questions
Is a leash required for a service dog?
Usually, but not absolutely. The regulation requires the dog be under the handler’s control, and says it shall have a harness, leash or other tether — unless the handler is unable to use one because of a disability, or a tether would interfere with the dog’s safe and effective performance of its work. In either case the dog must be under control by other means.
What are the exceptions to the service dog leash rule?
Two. First, the handler cannot use a harness, leash or tether because of a disability. Second, the tether would interfere with the dog’s safe, effective performance of its work or tasks. Either one on its own is sufficient, and neither requires documentation or approval.
Can a service dog be off leash in public?
Yes, where one of the two exceptions applies and the dog remains under the handler’s control by voice, signal or other effective means. Off-lead is not a general permission — it attaches to a specific reason, and the control standard is unchanged.
Does a local leash law apply to a service dog?
Not where it would defeat a federal exception. Under 42 U.S.C. 12201(b), state and local laws stand only when they give equal or greater protection to people with disabilities. A municipal ordinance that restricts a handler further offers less protection, so it does not override the ADA.
Does a mobility harness count as a leash?
Yes. The regulation names a harness as one of the three acceptable options, alongside a leash and any other tether. A dog working in a rigid mobility harness is already tethered, and a separate lead is optional.
What kind of leash should a service dog have?
A fixed-length lead of roughly four to six feet, or a hands-free equivalent such as a waist lead or one clipped to a wheelchair frame. Retractable leads are a poor choice for working dogs — they give no precise control, the mechanism fails, and the cord causes injuries.
Do I have to explain why my dog isn’t on a leash?
No. Staff may ask only whether the dog is required because of a disability and what task it performs. Saying you are unable to use a leash because of your disability is a complete answer, and you are not obliged to explain the disability itself.
Can a business remove a service dog that isn’t leashed?
Only on the same grounds as any other service dog — if the dog is out of control and the handler does not take effective action, or if it is not housebroken. Not being leashed is not itself a ground for removal where an exception applies.
Do the leash exceptions apply on an aircraft?
No. Air travel is governed by the Air Carrier Access Act rather than the ADA, and 14 CFR 382.73(b) permits an airline to require a service animal be harnessed, leashed or otherwise tethered at all times in airport areas it controls and on the aircraft. That provision contains none of the ADA’s exceptions, so a team that lawfully works off-lead on the ground can still be required to tether when flying.
I’m a service dog handler of twelve years, not a lawyer, and nothing here is legal advice. The regulation quoted is 28 CFR 35.136(d), and the relationship between federal and local law comes from 42 U.S.C. 12201(b) — both free to read. The eight examples are my application of the regulation’s wording to situations handlers actually face, and reasonable people could argue about the eighth, which is why I’ve flagged it. If your team relies on one of these exceptions and I’ve described it wrongly, tell me and I’ll fix it and note that I did.