We have seen a vet and sought a second opinion but I'd like to know if anyone has noticed this kind of behaviour before and found out the source of the problem.
Our boy (neutered, Russian Blue aged 3-4, indoor) started occasionally tapping his rear paw (right) on the ground, like a rapid staccato lasting a second or so. He'd also lick the paw in question and pull at his claw with his teeth. This started several months ago. At the time, we checked out his paw and couldn't see anything amiss, and decided to leave it and keep an eye on it. The tapping only seemed to happen every few days that we noticed.
A few days ago we noticed him tapping way more frequently, like a few times within an hour, as well as a swelling in top of the rear paw (knuckle area) and I decided to take him in to see the vet.
He has been eating, drinking, passing waste and sleeping pretty normally, although lost a small amount of weight over the last several months.
The vet found some irritation and inflammation around the base of his claw, which she said could have been because of him pulling and licking it. Couldn't find a puncture wound or obvious injury. Said it could be a foreign body or could be a bone/ligament issue.
She put him on a combo of topical treatment (disinfectant plus steroid cream) plus antibiotics and said to see how that goes then come back in a couple of weeks for an x-ray if still an issue.
Since our boy does go outside supervised on a harness, it's possibly a splinter or shard of something which has embedded itself in there, but I thought I'd ask the good people of Reddit if they'd had any similar experiiand how they turned out.
TLDR: cat tapping rear paw repeatedly on ground and wondering what the cause could be. Vet advice has been sought.