They do work great! I had a 20-pound terrier whose paws fit in the spaces in my short chain link fence. Without it he learned how to climb it and get over in just seconds. On the 75-foot trolley wire (with a 15 foot drop line) I put stops to keep him from contacting the fence where he could hang up. He had a dog house, a big tree for shade, an old rug for comfort. He lived to the ripe old age of 14 when he died last year.
We had a great dog that lived to
be the same age. She never spent
a single day indoors. An insulated
and light bulb heated dog house.
We’d check on her during bad
weather, in her house, to find her
sound asleep and comfortable. She
had plenty of “free” time, as my
kids and her were inseparable.
The wife is alergic to pet dander,
but the kids really wanted, and
loved that dog. Tizzy. She was
never tied to a chain, but had
a penthouse of an enclosure.