After cats are sterilized, they are diagnosed with feline thrombosis. The two seem to have little connection: sterilization is an operation on the reproductive organs, and thrombosis is a multiple disease of the brain and body. However, complications after sterilization surgery can cause blood clots. If the cat’s hind legs are weak and unable to walk after neutering, it may be due to the effect of anesthetics, but it is not definitely a cat thrombosis. You can observe it for a while to see if it recovers.