Best thing I have ever found for the claws besides clipping them yourself is to put a brick slab, 12"x12"x1" or 18"x18"x1", in the cage. (man I almost put in the tank) As the piggies walk over the brick, it wears down thier nails. The brick(s) can be bought at Wal-Mart, Home Deopt, or Lowes or what ever home improvement place you frequent.