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Hmm.... I don't know if I've ever heard of berners being diggers...
The only reason that they dig is because they are bored. Not sure how long you keep them in the yard but try going out with them and playing some games and tiring them out a bit before you leave them. Also try giving them something to do while they are out there - mine LOVES his soccer ball!
Otherwise, I'd suggest crate training if you are going to be gone all day. It's really not a big deal to them, and that way you know they aren't getting into anything. It's better that they have their own den to retreat to then to be bored/anxious while left in the yard alone.
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