noun
service dog
A dog trained to assist people with disabilities, such as guide dogs, hearing dogs, and mobility assistance dogs.
介助犬は、身体障害者の日常生活を手助けします。
Service dogs assist people with physical disabilities in their daily lives.
聴導犬 are hearing dogs for the deaf or hard of hearing, a subset of 介助犬.
Compound of 介助 (assistance) + 犬 (dog). The term is a modern coinage reflecting the concept of service animals.