My dogs are big, neighbors remain a little sceptical of them because of their size. They keep digging from under the fence. Girl has been fixed,boy has not. I think he wants to find a female friend. I worked evenings, and will get calls that they have gotten out of an 8 ft fence.They will open the gate combine their efforts and size and push the latch open.
I recommend neutering the male as well. Look into an electric fence. vetcare