This type of therapy can be effective for animal lovers; treatment can include cats, dogs, horses, birds, or any number of animals. Research suggested positive results of this therapy for those with autism, medical conditions, depression, anxiety, addiction, and other problems. Trained therapy pets are also popular in hospitals, rehab centers, nursing homes, and other facilities. Animal-assisted therapy is used alongside the treatment with a psychotherapist, social worker, counselor, or other providers.