too cute!! i'd check his paws & pads real good after a romp. Bear had a tiny berry type hard ball thingy stuck & kept licking his paw...I never would have saw or found it had he not been licking like crazy. I separated each paw pad & found it. It wasn't thorny at all, just a little ball of a berry stuck between the skin area & aggravating him.
And, if ants ever get on his paw, he sits & looks at the paw! Telling me to help! I think they will stop if something hurts them & sit down to try & get it themselves.