Tia used to grind her teeth a lot more when she was a puppy (she is now 1yr, 2 mos). She''l do it on occassion now, but very rarely (thank goodness...I can't think of a more irritating sound!)
My guess is that it had/has something to do with her teething....or else just a habit she developed, and then grew out of.
As for what helps....nothing works better than adding a bully stick in her grip to buffer the sound
