So I need suggestions from dog experts. My neighbor has a dog that loves to dig holes under our fence. And I'm not talking about small holes. She dug one big enough to come over the other day. She's a medium sized dog. I have filled 4 or 5 holes with large rocks, but she just finds a new spot. There is a large 6-7 foot Wooden fence there but she's going under. It doesn't bother me to much I guess cause it's not aggressive but my 4 year old goes to the back a lot and freaks when he sees the dog trying to come over. Any way to bury maybe rocks under the whole fence line? Would that work or do dogs just dig deeper?