I’ve had Invisible Fence for the 20+ yrs. For the first dog, a shelter mutt, it was great. Then I got an Aussie/Ridgeback puppy and he was good on it until he hit about 2 yrs old and decided he wanted to leave pound friend and visit the neighbor’s little dog. I tried clipping the hair from around his neck to get a better ZAP! I also tried a stronger battery and finally ended up giving him to a girl from work with 5 greyhounds. I didn’t want to come home to find roadkill.
I’ve since had a Rottie/Shepard mix on it, currently an Australian Cattle Dog (heeler) and another mixed breed, all pound dogs and they’ve been good. Oh yea, I also had a Chow mix that ran through it after deer and went back to the shelter, but for other reasons like snapping and growling at the hand that feeds it.:sigh:
People are right in that while it might keep your dog in, it doesn’t keep other dogs out unless those dogs happen to be wearing IF collars. That did happen once with 2 labs that were loose out on the road, saw my dog and decided to come to visit. They got zapped and immediately left with their tails between their legs. Animal control did catch them though and eventually found their owners.