Just a quick request and I know it sounds a bit mad, but one of our cats has just had to go to the vets for an ingrown claw, she showed no signs of pain or limping, just occasionally held the paw up.
When I checked her poor little paw the nail had grown into the pad about half an inch and it was obviously infected as it was smelly. She is now home and must be much more comfortable, but it was surprisingly easy to miss - she'd even had a vet check a few days earlier where it wasn't picked up.
All my other cats have now had their paws checked, but I'd hate to think how many there could be with a similar thing and a quick look is all it takes. :)