One important thing to remember when using a cat leash is to never leave your pet unattended outside unattended. It may seem like a good idea to tie the cat leash to a fence so that the cat can experience the outdoors while you find something else to do, but this can be very dangerous. Cats are small and may become entangled in the leash. If they are unable to free themselves they may end up choking themselves to death or cutting off circulation to a limb.