Teaching your cat to walk on a harness and leash is a great way to let your cat enjoy the outdoors while ensuring his safety. Outdoor excursions can reduce obesity and boredom-related behavior problems that many underexercised indoor cats develop. Leash training also comes in handy during trips to the vet and other necessary travel. Before you get started, be sure your cat is up to date on his vaccinations. If your cat is in fact up to date then please enjoy this guide provided by the ASPCA to train your cat to walk with a leash.