no leash. so far they have both been extremely well behaved, never going farther than my yard. mostly they like to sit on the porch and watch me do yard work. but i know there is a danger. i tried to use a leash with my previous cat halley, and every time i put it on him he immediately rolled over onto his back and refused to move. these cats might be different though. so now that you mention it i'll give the leash a try.