I'll be more thorough.... 
He had started limping about 5 months, after a visit to the vet (a locum as mine was away) she gave him anti-inflamms, said to take it easy and he'll come right.  After a couple of weeks, and no improvement i took him to a guy in Pallara who specialises in spinal rx for canines  this guy was brillant (although Rico didn't think so..) and soooooo much cheaper, his limp was gone in a few days.  I rested him for 2-3 weeks and back out on the streets we went.. 
He started limping again about 2-3 weeks ago, again, gradually getting worse. 
I decided to have xrays because i thought it may be something a wee bit more sinister and i wanted to fund my vets next holiday...  
It was a physio (for humans) who suggested the nerve impingement, however it was just a guess-timate.  i'm inclined to agree as Rico's usually up to something and his paws where they shouldn't be    I'm told there is only 1 or 2 phyiso for canines in brissy?? 
It wasn't the vet who suggested pedigree. And i whole heartidly agree that canned food is crap...  Good for laxitives hey..hmm i'll remember that one.. 
I have him booked in again at Pallara but this guy is pretty popular and we can't get in for a while, so i thought i would just ask you guys... 
 
Rico & Carley