At times this year Penny seemed to be limping slightly. The vet said that he felt a slight 'click' when he manipulated her leg. We watched her in many different situations and couldn't quite see whether the limp had disappeared but we decided to err on the side of caution and kept activity to a minimum for some time. She has also been taking 'joint' supplements. I think she's okay now...
Because of the difficulty of being absolutely sure Penny is moving freely I was interested to read a posting by Dr. Patty Khul, known as Dolittler, a vet whose blog is subtitled A veterinary blog for pet lovers, vet voyeurs and the medically curious. She says she feels frustrated by clients who won't take her word for it that their pets are in pain - she finds that she often has to actually cause the dog to whimper or squeal before the owners will realise the pain is real.
The posting is an interesting take on the vet's view of these situations, and also has comments by others.
This site is worth a visit just for its own sake, but it also has a wealth of links to other interesting material.