Marge got her very first massage from Marisa today.
Before she started, I asked her to watch as I gaited Marge around the room to see if she saw anything. She could just barely tell that it was the right hind that was off. When I stood Marge in place, she could tell that she wasn't putting all of the weight on to that leg.

She's actually not doing it that badly in this picture, but you can *just* see how the left hind is planted to the ground slightly more than the right. Sometimes it is more extreme, other times, she looks normal.
Any way, massage commenced. It was about a half hour long - didn't want to over do it for the first time. Marge was actually pretty good about it - she didn't want to lay down (which is supposed to be the best way to do it), but got her neck, triceps, back and hind legs done. Marisa said Marge was tight in her neck and back, and that it was possible that a pull in those places (especially the back) could trickle down into the leg, causing the problem. Then, she got to the rear hind leg, though - and almost immediately said that Marge's hip flexor was somewhat inflamed.
After reading some (which I know I shouldn't do - the internet can make you panic), I understand this to be a group of muscles. I suppose she was just simplifying for me, which something I need - I know next to nothing about this stuff! The vet didn't feel it as clearly because she didn't manipulate the muscle like a massage therapist would, she explained. In any event, she wasn't overly concerned - she said Marge would definitely be up and running by the trial. She told me to keep giving the Rimadyl and maybe occasionally hold ice to it.
I'm happy that she doesn't think this is anything severe, but I'm also worried about rushing back too soon. The trial is Friday, April 2nd; I guess I will just play things by ear.
(Just got my tentative schedule for the trial, too. Novice JWW runs at 9 AM, before Standard, which I am super happy about since the judge is more inconspicuous in Jumpers. Standard runs about 4 hours later, though. That's a lot of waiting around. Let's see if we even get there.)