Could be any number of things. She could be bored, or have an allergy, or perhaps she is biting her nails. Years ago I had a Lab/Shep mix that kept her own nails neatly trimmed on all 4 feet. Dew claws included! (wish Bo would do that!) Barb Bowes Bo, Molly, Chelsea (Pyrs) & Flopsy (Pyr Shep) The more people I meet, the more I like my dog! bamb@monmouth.com