Dogs used for assistance, detection, search, or other work need abilities suited to the particular role. Breed alone does not establish suitability.
For ADA service-animal access, any breed and size of dog can qualify when the individual dog is trained for disability-related work or tasks and meets the applicable behavior requirements. Select a candidate with help appropriate to the tasks, health needs, and working environment.
The earlier breed list included a recommendation to choose giant breeds for weight-bearing brace work. That recommendation has been removed. A dog’s size does not establish that loading its body is safe.