My digger gets daily exercise several times a day when the younger dog forces her to play! She also has a very, very large yard in which to run, cows to bark at, territory to guard and mark....but she still manages to dig holes. She gets socialization with the whole family each day, with the chickens, cat and another dog all day....but she still digs. She has things to do all day if she wishes....but she will dig. Sometimes thats just the "exercise" she wants apparently!