I had to work a full 12 hours today so I had a friend of mine come over in the afternoon and take Bud, Tash, and Docker out for a long, off-leash walk with his two (yeah, I don't know how he did it either!). When I got home and took them out, Buddy was limping quite badly and then later when a friend of mine stopped by, he went to run (barking) to the door and really yelped as he got up. I'm sure he just played too hard today (he's getting too old to keep up with them young whipper-snappers). What is safe to give him so that he is not in pain for the moment, I already know I will have to limit his exercise for the next couple of days and may end up at the Vet's if it doesn't get better quickly, but can I give him Children's Tylenol, or something like that, for the moment?