The Need for a Harness and Leash
Collars can allow your cat to squirm out easily and offer a quick escape if frightened. Investing in a harness and a leash that is the best fit for your cat is best to start with.
Should cats be kept on a leash?
Does Your Cat Want to be Leashed? Not every cat wants to be on a leash. Most cats should be given the opportunity, if not simply to enrich their lives with more sights, smells, and time outside. It's important never to force your cat to “acclimate” to the leash life.
Can I walk my cat without a leash?
Although RSPCA policy is that a leash and harness may be used to walk cats outside the owner's property under direct supervision and despite some owners successfully training their cat to walk on a leash, in general the RSPCA does not recommend it.