My 2 yr old Jack Russell Sophie, has this strange habit. We move place to place and stay at hotel quite often so we usually play with her in a bed. She will bring her favorite toy or ball of the day to us to play with her, after we play, sometimes we have to quit because there's something that we need to be doing. When we quit playing with her, she seems to play with herself by trying to get to her ball through the blankets on the bed. She doesn't bury them completely just enough so she can still see and know where the ball is but she will try to tug at the toy while its under the blanket. Can anyone explain why she does this.