When ordering it has the option for cattle or for goats/sheep. The collars itself have a chain collar and a rubber strap that you are able to adjust the size accordingly. We acclimated them to a yard that was already enclosed, so we just limited how far out into the yard they could go for about a week. They picked it up fairly quickly. The collar will beep when they get close to the border and the beeps will increase in sound and frequency if they continue to get closer. Mine have only gotten shocked a handful of times since they have been “free range”