I've never let mine outside at all, but my mom takes her cat out on a leash all the time. She has a really long leash and then my mom will sit in a lawn chair and tie the leash to the chair. Usually my mom will sit for about a 1/2 hour and read a magazine while Kitty rolls around in the grass. I don't think she ever really meows to be let out. I think as long as she is on a leash take her out, just make sure to let her know it's on your terms and not hers. Not letting her out when she meows is a good idea.