Mostly because it has come out of place. I’ve recently recovered from my knee surgery to fix my Luxating Patella. This is a common problem for little dogs like myself, where your kneecap pops out and makes walking difficult. So I had the surgery and everything was fine. It had something to do with fixing the groove so the kneecap stays in place.
Except after a while, the pin that was used in surgery to help keep the kneecap in place came loose. My vet assured me this was not a problem.
Then I started limping and hip-hopping so it became a bit of a problem. The answer was to remove the pin. It was no longer needed and served its purpose. Lucky for me this was a simple outpatient procedure that just required a local anesthetic. In less than 10 minutes the pin was out. I didn’t even require stitches.
Daddy was told not to let me lick the area where the pin was removed. So, of course, the first thing I did when I got home was to lick that area. What? It required my attention. I had to clean it and help it to heal. Don’t even think of putting that ugly cone around my neck.