There have been lots of threads on here lately regarding limping and Diesel has had it frequently on different legs front and back
He has been taken to the vet and its usually muscle strain or just a pulled muscle etc - pain killing and anti-inflammatory injection and some metacam few days with rest and no ball chasing and he is as right as rain

We have put it down to the fact that he was never walked as a pup just chained up in a yard in his life before me.
However since I had him at 15 months his one back leg has always been a bit "dodgy" for lack of a better description and he has always sort of "crabbed" as he walks or runs (not all the time).
The vet has said his hips are good and his agility trainer says some big long dogs do this.
The last few days he has developed a limp on his dodgy back leg and it doesn't seem to be going away. He is ok in himself bright and eating etc but hes hardly putting any wait on it at all and I am thinking perhaps I should get some more tests done or some x-rays especially if he continues with the agility
Any thoughts guys???