Sentence:  Reggie was a “release” from Guiding Eyes; he kept leading his trainers into light poles, so he was deemed temperamentally unsuited to be a <WSD>service dog</WSD>. 
Meaning of the word marked with <WSD> tags:  A dog, such as a seeing-eye dog or a hearing-ear dog, which assists a person who is physically handicapped or who suffers from a mental disability such as post-traumatic stress disorder.