Honestly, RRichmo, I think a solid fence would be better. I know of people with hunting dogs who use a solid fence, and only back it up with an invisible fence if they need to prevent digging. But most of the people I know who've tried just an invisible fence say that they're dog sees some prey or catches a scent and they blow right past the fence. And unfortunately, once the heat of the chase wears off and they try to get back home, the invisible fence keeps them out of their yard if they've got the collars on.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."