You might do better with Adequan shots (injectible glucosamine) and then follow up with glucosamine tablets like Cosequin or Glycoflex for his arthritis problems.
Depending on how cold it is near you a heated pet bed may also help him and swim therapy might help with joint mobility and pain too if the swimming or walking is in warm water.
The Deramaxx may be hurting his liver.
Talk to your vet about alternatives including using Ascriptin buffered aspirin in limited doses instead of the Deramaxx.
Hope this helps you!
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