That's a good option, I looked at them but didn't think I needed it since I thought I built the fence well enough. I thought wrong..
Dogs are extremely intelligent...and properly motivated, a fence isn't much of a challenge.
As our neighbor Joe learned when I was a kid.
I had a dog, half Cocker Spaniel, half Dachshund. "Blackie" only grew so high at the shoulders, then he just got long.
Joe tried for the longest time to raise pure bred Beagles. Blackie, however, kept "f*cking" that up, to put it bluntly.
Joe even built an awesome kennel for his Beagle bitch.
Blackie, as it turned out, was a master fence climber. There wasn't a fence in the neighborhood he couldn't get over, properly motivated. And apparently a Beagle bitch in heat is one HELL of a motivator!
Joe came over one day when Grandpa and I were sitting on the front porch. He was in a baaaaad mood (apparently his Beagle had just given birth to ANOTHER fine litter of suspiciously black puppies).
After a few minutes of listening to Joe, Grandpa dug into his pocket, pulled out a condom, gave it to Joe and said "give this to your Beagle bitch to use. Next time Blackie pays a visit, she can ask him to use it."
Now, I was waaaay too young to appreciate the adult humor in this, but it was funny to see Joe stomp off. Years later the story was even funnier retold as an adult!