Quote Originally Posted by KittyGurl
Take her to the vet! Her back may be in pain.
I agree. Talk to the vet. Maybe her back is hurting her, maybe she has an infection somewhere.
But terriers can be incredibly barky and they can get a little snappish, too. Just in case, I think you should keep her away from your kids, especially the three-year-old. She can't really defend herself against a raging dog, and she might even think it's just playing.

good luck!