Can't say I have heard of laser treatments, however, I have many friends with performance dogs
(obedience, agility, etc) that often take their dogs
for chiropractic treatment, acupuncture and acupressure treatments. Also, hydro therapy is often very beneficial. You might check into that.
I assume your dog would be able to paddle in a bath tub if it were filled and you could try this daily. He need to be able to paddle with support.
Of course, check with your Vet first.