Is my Dobermann's rear weakness wobbler syndrome or joint disease?

Dobermann rear weakness at 8 is a question I have to handle carefully — the breed is one of the highest-risk for cervical spondylomyelopathy, which is wobbler syndrome, and that's a neurological condition the shopkeeper can't help with. The distinction between wobbler syndrome and hindquarter joint disease matters clinically. Is the weakness symmetrical, and is there any knuckling over of the rear paws when he walks?

The occasional rear drag when tired is a neurological sign that the vet needs to assess — it's consistent with wobbler syndrome involvement and not something I'd try to supplement around. The joint stiffness component, if there is one, can be supported, but wobbler syndrome requires veterinary diagnosis and its own management plan. Go to the vet appointment with that specific observation noted. In the meantime, Antinol Rapid is safe to start — it addresses both joint and spinal disc inflammation and won't interfere with the assessment. But the rear drag needs the vet's eyes before any supplement takes the place of a proper neurological workup.