“So why is this happening with my senior kitty? This is new.” As a cat ages, arthritic changes in the bones of the feet also change, as well as other parts of the body. The toes start to bend slightly forward, making the nails grow more in a circular fashion and sometimes directly into the pads of the feet, causing pain and infection. I have seen cats with such a bad infection a trip to the veterinarian is required along with antibiotics. An older kitty especially needs their nails cut at least once a month. Keeping them trimmed back will make your little senior baby pain free.