@jcboy,
Jcboy, thinking about the fence and gate.
Does the gate have concrete under it?
There are fence solutions, given you have one already.
A) there are underground invisible fencing ads all over the place on the internet and I've not experienced those myself. Did read something about that dog has to be trained for it, or it will dig past it and then not want to come back. (no link, I was just skimming.
B) I'm a believer in strong fencing. (California, ya'know). If I already had a strong fence, and it was my own yard, I'd consider pouring a curb wall, that is concrete, 4" wide, 12" or 16" deep, probably with one set of horizontal rebar or fibers through the length of it, the whole thing not projecting far above the surface. Or, a 2 x 12 board to do the same thing, probably set in place with long rebar every so many feet. The curb wall would go close to the fence, probably just behind the post concrete.
Or - concrete blocks with filled cells..
This is just off the top of my head, don't take it as gospel.
C) Consider heavy stone pavers under the fence lengths, facing into the yard.. I do mean heavy, thinking 1 1/2 to 2" x whatever.
D) Concrete path by the fence. This would probably mean moving plants.
Done musing for now.