Harnesses with a lead is a great way of taking your indoor cat outside and become familiar with their surroundings. Cat & kitten harnesses are shaped and designed to fit your felines body properly, where using a dog harness will likely allow your cat to escape. You may be able to use a small dog leash if it is light enough for your cat. It is important for your cat to know the outside of your home, in case they do get out, they will need to be able to see familiar sights they know to find their way back home. Buy cat harness & leads sets online.