bad doggy mother

Well, it's official...I am a bad doggy mother.

Bill and I got back from CO on late Monday night, and I went to go pick up Sunny at the dog farm on Tuesday after work. He was exceedingly happy to see me even though it's a fabulous place with radiant floor heating, large indoor/outdoor runs, and daily playtime. But he just seemed out of sorts when he got home. Not unusual. He gets in a huff when he he has to be away from home.

Wednesday...still out of sorts, but I was working from home, so he pretty much just laid around. I thought, "oh, how sweet. He's just exhausted from his stay at the dog farm."

Thursday...still out of sorts. "Is he sick? Is it just the colder weather??"

Thursday night, right before bedtime...I realize he's limping. That's right! It took me 2 days to realize that my dog is strongly favoring one of his back legs.

And that's where I am right now--I'm just observing him (not much to observe as he's just laid around most of the day today). If he isn't doing better by Monday, he'll take a trip to the vet.

I don't think that it's broken because he's still able to run on it, jump up and stand on just his back legs, and get up and down the stairs and bend it somewhat. But maybe it's a stress fracture? Or just a sprain or strain? Should I put ice on it or try to keep him from running around and going up and down the stairs? I don't know anything about dog physiology...can anyone help??