You can have a service dog for any disability, whether physical, sensory, psychiatric, or intellectual, as long as the dog is trained to perform a specific task related to that disability. There is no official list of qualifying conditions. Under the ADA, what matters is the combination of a disability and a trained task that directly mitigates it.
That opens the door wider than most people expect. Here’s a breakdown of the most common conditions and what service dogs actually do for each one.
Physical and Mobility Disabilities
People with conditions that limit movement are among the most visible service dog handlers. This includes spinal cord injuries, multiple sclerosis, cerebral palsy, muscular dystrophy, arthritis, and amputation. The dogs are trained for physical tasks like bracing to help their handler stand up, pulling a wheelchair, picking up dropped items, opening and closing doors, pressing elevator buttons, or carrying objects.
For people who use wheelchairs or walkers, a service dog can retrieve items from shelves, help remove clothing, or turn light switches on and off. Some are trained to help their handler transfer from a wheelchair to a bed or car seat by providing a stable point of support.
Seizure Disorders
Seizure response dogs are trained to take action when a seizure happens. They may position themselves to prevent injury during a fall, move dangerous objects away, press an emergency alert button, or retrieve medication once the seizure ends. Some dogs are trained to lie next to or on top of the person to provide deep pressure that can help shorten the episode.
Seizure alert dogs go a step further. Some dogs appear to detect chemical or behavioral changes before a seizure starts, giving their handler time to sit down, move to a safe location, or call for help. This ability often develops through the bond between dog and handler rather than being formally trained from the outset.
Diabetes and Other Medical Conditions
Diabetic alert dogs are trained to detect blood sugar changes, likely through subtle shifts in body chemistry that humans can’t perceive. When the dog detects a dangerous low or high, it alerts the handler with a specific behavior like pawing or nudging, giving them time to check their levels and respond.
Service dogs also assist people with conditions like POTS (postural orthostatic tachycardia syndrome) by alerting to drops in blood pressure or heart rate changes before fainting occurs. People with severe allergies use allergen detection dogs trained to sniff out specific triggers like peanuts or gluten in food or environments. For any of these conditions, the dog can also be trained to call for help by pressing an emergency phone button with its paw or nose.
PTSD and Anxiety Disorders
Psychiatric service dogs are fully recognized under the ADA, but this is where confusion with emotional support animals tends to arise. The key difference: the dog must be trained to perform a specific task, not simply provide comfort by being present.
For PTSD, dogs learn to interrupt flashbacks by nudging or pawing at their handler when they detect signs of a dissociative episode. They can perform “room clearing,” where the dog checks a space before the handler enters, which helps veterans and trauma survivors feel safe. Some dogs are trained to stand behind their handler in public to create physical space, reducing the hypervigilance that comes with feeling exposed.
For anxiety disorders, dogs alert to rising stress by recognizing physical cues like fidgeting, foot tapping, skin scratching, or freezing. They interrupt the cycle by jumping up, vocalizing, or making physical contact. Nightmare interruption is another common task: the dog wakes the handler during night terrors by responding to thrashing, elevated heart rate, or sounds of distress, using physical touch or even turning on a light.
Dogs can also be trained as medication reminders. In response to an alarm or at a set time of day, the dog retrieves the pill bottle and persistently nudges the handler until the medication is taken.
Visual and Hearing Impairments
Guide dogs for people who are blind or have low vision are probably the most widely recognized type of service dog. These dogs navigate sidewalks and intersections, stop at curbs and stairs, steer around obstacles at both ground and head height, and guide their handler through doorways and crowded spaces. The dog initiates forward movement on command and maintains a consistent path until it encounters an obstacle or change in elevation.
Hearing alert dogs (sometimes called signal dogs) serve people who are deaf or hard of hearing. They’re trained to make physical contact and lead the handler toward specific sounds: a doorbell, a fire alarm, a ringing phone, a crying baby, an oven timer, or someone calling the handler’s name.
Autism and Developmental Disabilities
Children and adults on the autism spectrum use service dogs for several purposes. The dogs can interrupt repetitive or self-harming behaviors, provide deep pressure during sensory overload, and anchor a child who tends to bolt in public by being tethered to both the child and an adult. For adults with autism, service dogs help with transitions between environments and reduce the social stress of navigating public spaces. The dog can also be trained to find an exit and lead the handler out of a building on command, which is useful during moments of overwhelm.
People with intellectual or developmental disabilities may use service dogs trained to help with daily routines, medication schedules, or navigating public transportation.
What Doesn’t Qualify
Emotional support animals are not service dogs under the ADA. If a dog’s mere presence provides comfort but it has not been trained to perform a specific task tied to a disability, it does not have public access rights. Therapy dogs, which visit hospitals or schools to provide general comfort, also fall outside the ADA definition. The line is clear: the dog must do something in response to the disability, not simply be there.
No Certification or Breed Restrictions
There is no legal requirement for certification, registration, or professional training. You can train the dog yourself. No vest, ID tag, or special harness is required either. Any breed and any size of dog can be a service animal. Online “service dog registries” that charge fees for certificates or ID cards have no legal standing.
Businesses and government facilities can only ask you two questions: whether the dog is a service animal required because of a disability, and what task the dog has been trained to perform. They cannot ask about your specific diagnosis, request documentation, or require a demonstration of the task.
Where Service Dogs Can and Can’t Go
Service dogs are allowed in virtually every public space: restaurants, stores, hotels, hospitals, schools, government buildings, ride-share vehicles, and public transit. In a hospital, for example, a service dog can accompany you to patient rooms, clinics, cafeterias, and exam rooms. The few exceptions are environments where the dog’s presence would compromise sterile conditions, like operating rooms or burn units.
A service dog can only be asked to leave if it is out of control and the handler doesn’t correct the behavior, or if the dog is not housebroken. Even then, the handler must still be offered service without the dog.
For air travel, the Department of Transportation recognizes only trained service dogs (not emotional support animals) under the Air Carrier Access Act. Airlines can require you to fill out a DOT form confirming the animal’s health, behavior, and training. For flights of eight hours or more, a second form may be required confirming the dog can relieve itself in a sanitary way. The dog must be well-behaved on board. Airlines can deny transport if the dog is disruptive, poses a safety threat, or is too large for the cabin.