Dogs are highly biddable (enjoy working for people) and trainable. They are readily available and easily cared for. Dogs are capable of performing many useful tasks to help their disabled owners. They are more socially accepted than most other domesticated animals.
As of March 15, 2011, in the US only dogs can be considered service animals under the ADA. That means that only service dogs can be used in public accommodations where pets are not permitted unless permission is given (with some exceptions for specially trained miniature horses). Only dogs can be considered service animals in state services including state owned housing. In most other housing and in commercial flying, service animals can still be of any commonly domesticated species.
|2011-02-17 HUD memo on new ADA regulations on assistance animals.PDF||170.17 KB|