My boxer would always dig in the backyard before we moved into apartments. I noticed the only time he didn't dig is when he got tons of exercise. I know it is a pain to go out and walk the dogs when its cold, but you chose a high energy breed that needs tons of daily exercise. Romping around in the backyard, unfortunately, just isn't enough for a Boxer/pittie. Try to up the exercise and see if it does some good.
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