An iliopsoas injury is as near a "groin pull" in a dog as you are going to get. I'm not an expert, I can only tell you my experience. Fin exhibited no outward signs of injury. She did not limp or act ouchy. What she did do, was avoid jumps, smash into jumps (not just knocking bars, but completely taking jumps out), and at times did not respond to handling on course. My first thought was I was doing something wrong. But the truth was that she was hurting and jumping was difficult for her.
Once I received the diagnosis, I was relieved that it wasn't something requiring surgery, and perplexed as to how I was going to fix it. I went to see Dr. Sams Clinic in Mill Valley (thanks to Katrina!). Basically he said, straight walking ok, otherwise rest. No swimming, no running, no trotting, no nothing except for leashed walks on the flat up to 2 miles everyday. 4-6 weeks. I decided to go the distance and ended up doing 8 weeks of rest before starting to introduce more to her exercise program. If you know Fin, you know she has two speeds (run as fast as I can turning on a dime then running more and sleeping). Fin is not a lazy dog, she is actually a little nutty. She can be reactive in a spinning barking run around sorta way. Fin is all about explosive movement...makes for a great agility dog...doesn't make for easy rest.
We kept to our plan with the rest stuff and then at 8 weeks I added hill work and some trotting. At 9 weeks I added more trotting and some off leash running (sending around a chair). At 10 weeks I set up a circle of jumps with no height and had her run through the jump standards.
Now we are all about the conditioning and rehab. In Fins future is more trotting, more hill work, adding balance ball stuff, adding lots of turning work, and swimming. The main thing that Dr. Sams has said to prevent this injury in the future is to ensure that Fin is warmed up before allowing the "explosive" movement she is fond of. Pretty darn easy to do when I'm out doing agility, a little more difficult in the house.
I do hope that Fin recovers from this injury completely. I'm hoping that in 6 weeks from today that I can return to agility class. I would very much like to sign up for an agility trial or two in August. This injury is the kind that is persistent. My understanding is if you don't give your dog the time to heal, they will simply re-injure themselves and it is worse if they keep doing it. Rest is the main component to rehabilitation that everyone agrees on. For me, only time will tell if all this work will pay off. I suspect that it will.