This morning, the doorbell rang, and elderly three-toothed dog and tiny dog both galloped towards the front door as usual. When I arrived in the front hallway, however, elderly three-toothed dog was on his side by the door, looking exactly like an overturned turtle -- twitching his legs, yet unable to right himself. He must have slipped in his haste to bark at the offender who had rung the bell.
I picked him up and carried him about for a few minutes, until I was certain that he had not injured himself. That one back leg which occasionally bothers him is still clearly a bit troublesome, but all in all, it does not seem as though he hurt anything other than his tiny canine pride.
My brave and fierce elderly three-toothed dog. We'll take care of you.