Hi Lori,
My sympathies to your friend. I owned a horse from 2000 to 2007 that became ataxic. Besides the vet, I hired an equine neurologist, a chiropractor, an accupuncturist and an equine sports massage therapist to help this mare. There were conflicting opinions as to whether the cause was wobblers or whether she developed a spinal injury from a fall. Anyway, with careful management, she was ridden on flat land but only at a walk and successfully gave birth to a foal. Unfortunately, I let a friend care for her one winter who pastured her in a very steep pasture...although she had four other level pastures available. The steep inclines, ice and snow caused the mare to fall, seriously injure herself and she had to be put down.
We also had a horse at a barn I boarded at who also developed ataxia due to a spinal issue (I was never clear what happened) but this horse, Devo, had surgery and what many people call the Seattle Slew cage (a spine stablization cage) was implanted. Devo, prior to its back injury, had been shortlisted for the 2004 Olympics for the Australian team. After Devo recovered, he competed in dressage. My daughter rode him for a bit over jumps, but every once in a while Devo would suddenly fall on a jump course, so the owner confined his activites to dressage. As far as I know, Devo is still alive and well.
Based on my experience, if your friend rides her horse conservatively and keeps him on stable, flat terrain, he should do fine. I became a certified equine sports massage therapist for my horse and, during the seven
years she was alive, gave her massages at least twice a week. I like to think it helped...it certainly made us closer and made me feel there was something I could do for her. Best wishes to your friend.
Ruth Heilgeist
Happiness comes of the capacity to feel deeply,
to enjoy simply, to think freely, to risk life, to be needed.
-Storm Jameson