You mention about your pup having a problem jumping up on a bed and other things, in addition to being sensitive when you touch him near his tail, on his back. And then there's the incontinence.
I would strongly suggest that your pup may have a back problem, possibly a pinched nerve due to a disc problem. Older dogs who are sensitive in this area can exhibit tenderness and yelp even when you just walk near them if they are hurting.
Urinary incontinence can be the result of a neurological problem as there is a loss of control going on. I'd have an xray of the little guy's spine to see if there's anything mechanically going on before anything else.
Hope this helps! Barbara
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B.Shap
