My dog seemed better so I stopped the supplements — now they're worse again

The improvement you saw was the supplement working — stopping it meant that effect started reversing within a few weeks. This is one of the most common patterns I see: the dog improves, the owner thinks the problem is solved, the supplement stops, and 4–6 weeks later the stiffness is back. Joint disease is ongoing; the supplement manages it but doesn't cure it. What was he on, and how long since you stopped?

Restart the Antinol Rapid today. You'll likely see recovery to the improved state within 2–4 weeks — faster than the initial response, because the joint hasn't gone back to pre-treatment baseline, it's just lost the supplement support. Then the key is recognising that this is a permanent daily medication, not a course. Antinol Rapid for a dog with established arthritis is like blood pressure medication for a human — you stop it and the condition comes back. The goal is improvement and maintenance, not cure and stop.