Just returned home from the Vet with a rather sleepy Poncho. He got his hips x-rayed today and is still a bit tired from the sedation.
Below you can see the X-ray. His right hip isn't as good as the left one, which fits nicely with his symptoms. They look a lot better than I had feared though. If judged by the kennel club the outcome might have been status C. The good news is there isn't any signs of arthritis. X-rays of elbows and back showed no abnormalities. This means Poncho is good to go for another season of agility :)