I have to say I HIGHLY reccomment the Petsafe wireless containment system for dogs. I got one for Blue yesterday, after him spending two months living every moment outside on a leash of some sort. For his own safety, so he wouldn't jump the fence to chase cars. After one time of hitting the end of the boundary, Blue realized the flags were what kept him safe. He's staying in the boundary lines and showing NO interest in cars! So, last night I let the dogs out without having to put Blue on the tie chair, and laid down to watch TV. Woke up several hours later and sounds of a fight were all in the yard, growling and snapping. Then I heard what I thought was someone stepping on a bag of chips, but a thousand times louder. I ran out, half awake, and found my dear Blue shaking the LARGEST oppossum I'd ever seen. He killed it, and it's babies, but it managed to kill my favorite hen first. If it weren't for this invisible fence, Blue would have been on his run cord/chain and that oppossum would have gotten away. Titan and Trixie had long since crawled through one of the open windows to come inside. So, Blue is back to being flock protecting Blue all thanks to my new, 300 dollar containment system.
P.S. He slept at the coop door for the rest of the night, barking and growling at everything that made a noise.