Hey nickers,
I'm not sayin' it's a hip thing, and I'm not sayin' it's not, but check one more thing. I think I remember you saying that Angus licks his paws alot. Well, Oreo was rolling his feet a few months ago when he walked. Of course he's a compulsive foot licker and I noticed the area between his pads/toes were all red and sore especially in front of the large pad. It seemed it was so raw that he would walk/stand goofy to keep from putting max pressure on it. Kinda lke if you had a bad blister, you might dance different. Well,... I guess you might dance different anyway, Nickers. The picture doesn't show the redness I'm talking about, but check behind the front toes for anything.
Regardless, it is probably best to have a vet check the little one out.
Also, and you probably did this already, check for anything stuck in the toes (spinters of wood, pieces of glass, loose legos, etc). Remember the Lion and the Thorn.
Jason