My 5 1/2 year old working cocker spaniel has been limping for a few days now. I can only think that he twisted something when he jumped off the settee. He doesn't seem to be in any pain & the limp comes & goes. At what point should I think about taking him to the vet? I took him out for a walk today & he was galloping around like a greyhound. Towards the end of the walk the limp came back. Any ideas?