Unfortunately, during one of the birthday parties, he was playing with balloons. While trying to get a balloon up in the air, he hurt himself. One of the discs in his spine shifted, and pressed on his spinal cord.

His hind legs were affected. Surgery was needed to remove the disc thereby alleviating the spinal cord compression. All was thought to be fine. Post-surgery Ariel’s legs stopped moving.
Now due to a long period of time not exercising, his muscles have atrophied and Ariel is temporarily paraplegic.