it sounds like his muscles may have become weak, my oldest (16 yr old chow) also does this due to muscle atrophy. Either way I would take him to the vet and it could be an easy fix such as water therapy or acupuncture, which was ahuge relief to my dog- she even fell asleep with it connected to the e...

I also have lyme disease, if your vet will treat him with Iv antibiotics for a few WEEKS that will show the most improvement and then follow that up with oral ones. Lyme disease is very controversial, mostly its with human physicians we find the most problems with but your vet shouldn't have an issu...