Oh, I didn't want you to take my post the wrong way. Paraplegia is ABSOLUTELY a cause for a service dog- I simply meant that a service dog MUST be task trained, even if it's only one task. From the way you described in your post, it sounded like he was being more used for emotional reasons, not your physical ones (which I know you have). But I also did not realize he was so young.
I have a few friends with SD's and have learned a lot and just wanted to share my knowledge, as I know it can be very confusing for folks to differentiate the two. I would NEVER think paraplegic is simply an emotional thing, not one bit and that's definitely not what I was trying to imply. I simply cannot even fathom. I would never in a million yrs think to judge someone with a service dog, I know the pain people go through, and it often is not visible on the outside. I myself suffer from certain anxieties that I don't discuss a lot (but still nothing compared to what you must go through), and having Jackson with me greatly improves this. I certainly understand the benefit of a dog for those who truly need it and appreciate a service dog like none other.
My only point was that legally, a service dog must be trained to a TASK. A task is a trained behavior that mitigates a person's disability by doing something the partner cannot do for themselves, but must be able to do in order to live. Even if you could benefit from a trained behavior, if you could do it for yourself, then it would not qualify as a task for your specific disability. A wheelchair might be a help to a person experiencing stiffness from arthritis, but if they are capable of walking on their own, then a wheelchair isn't really needed. Similarly, a dog trained to remind a handler to take medication, though helpful, would not truly be needed if the person was able to remind themselves to take their medication in ordinary ways, such as using an alarm.
Example: Chris has a hearing disability and can't hear sounds such as a smoke alarms, doorbells, sirens, or her name being called. Chris is otherwise able to function with no other assistance. Chris has a dog named Dusty. If Dusty is trained to let Chris know when a sound occurs (e.g., smoke alarm, doorbell), Dusty is considered a service dog. On the other hand, if Dusty is only trained to retrieve items around the house and does not know how to alert Chris to sounds, Dusty is not considered a service dog for Chris, because the task of retrieving is not directly related to Chris' disability.
Here is the rest of the info:
What tasks do psychiatric service dogs perform? | Service Dog Central
The terminology used to label specific types of work dogs perform for people with disabilities has not been standardized. For example, a dog trained to help a person walk might be referred to by different sources as a 'mobility dog', a 'walker dog', or a 'support dog'. Most dogs being used to aid in walking, would be larger, simply due to the safety issues.