Rotten feet of cats are probably caused by two major reasons. First, the environment in which cats live is humid, which also breeds a lot of bacteria. Cats’ feet often touch the ground, causing the toes to stay in a wet state for a long time. Once the skin's resistance drops later, it will cause bacterial infection, causing inflammation and ulceration between the toes; secondly, there is trauma between the cat's toes that the owner has not noticed before, so there is no timely treatment, and the cat's licking can cause wounds. Infection and ulceration occur.