Lyme disease would definitely be something to look at. I'd have the vet do a panel for multiple tick borne diseases.
Adding a good joint supplement would be a wise thing to do. Something that contains a combination of glucosamine, chondroitin, and MSM. Synflex has a liquid that also has some herbals for pain and inflammation. I'd also add a good quality fish oil.
Have you checked his paw to make sure there isn't an injury to a paw pad, or in between the paw pads?
You can also try massaging the leg, even his back, with an oil containing peppermint and/or wintergreen essential oils. this can help relieve pain and inflammation.
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