EMOTIONAL SUPPORT animals and service dogs are two different breeds, so to speak. Much more than loving pets with a purpose, highly trained service dogs spend months learning how to best help their handlers perform major life tasks despite physical or psychiatric challenges. For handlers and service dogs alike, intense commitment to working together leads to life-changing partnerships. 

SOURCE: https://health.usnews.com/wellness/articles/2016-11-23/how-service-dogs-provide-support