In order for an animal to be concidered a service animal, it must perform specific tasks. For example with ptsd: alerting owner that a panic attack is eminent, distracting owner to refocus his attention to avoid panic attack, reminding you to take meds on time, taught to walk full lenght of leash ahead of you so you will not feel crowded, wake you up from nightmares, wake you up if meds cause you to sleep through an alarm.
These are some of the things my service dog helps me with. She has a job. That`s what makes a service animal. The job.
If the dog doesn`t do things which help you with your medical condition, It`s not a service dog and by law cannot go in public places. It would be considered an emotional support animal.
teach your dog a job to help you. Teach him several.