trying to reach his bum

sam’s been acting a bit odd lately about his bootie, he tries to reach back there to lick or scratch, i’ve caught him scratching his nub with his teeth, also he’ll be laying there chilling and all of the sudden get up and start chasing his butt he does a couple of turns and lays back down to try and reach it, i’ve noticed him almost drag it on the floor but he doesn’t get to it, he’s pooping fine, i checked him back there (oh the things we do for our dogs) and he seems fine, no fleas, no ticks (i’ve combed him) it’s tough to get under his nub but i don’t see anything, i’ve washed him, nothing, he has nothing there, clean as a whistle. his anal glands seem fine… i’m puzzled, any ideas?

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