We live on an acreage. When mom and dad bought the house, they could not decide if they wanted to fence the yard.
Dad wanted to put in an underground fence (invisible fence). Even with training, some dogs that may be determined to chase a rabbit or animal will run through the boundary, shock or not. And after the shock, the owner has to hope that they can find the dog or the dog returns.
The first Sunday that mom looked out the basement door, she saw the neighbor’s big dog looking in at her. She didn’t think it was good that animals could come into the yard and bother us so she decided a real fence was the best solution.
This is a good article that discusses fence options and solutions for situations such as digging or fence jumping.
Peace in the Yard: 7 Ways To Dog Proof Your Fence.
radcliffdeafdog 
Katie Dunn
February 21, 2018 at 3:10 pm
I agree with your mom’s decision about a real fence being the best solution as its important keep your own pets safe and other animals out of your yard. I just got a dog and want to enclose my backyard as well. Because of this, I’ll definitely consider the seven ways of dog proofing once I get some fencing up. One of the methods from the link discusses using an L-Footer, but I think that placing bricks or large rocks on the sides of the fence should do the trick of preventing digging as well.