Not necessary! Just want to be able to change bedding or water without anyone running for the hills & jumping the fence into the yard w our dogs! We have a variety of breeds now, and they aren’t all friendly or cuddly, but none of them are afraid of me when I work outside. Much of my entire yard is fenced for them, and my dogs sometimes run outside the fencing. I don’t want them to try to “escape” me and get themselves killed. I do let them out of the fenced area into the woods next to the grass a few hours when the dogs are inside, so lots of space to move about. I also like to be able to call them back in as needed. My flock now runs when they hear me call.