I was just trimming Bella's nails, and I noticed that the pads on her front paws (the ones that are in the middle and up that she doesn't walk on) are kind of dried and crusty, and they are like a light yellow color. The big pad on her back legs has it just a little. I've always noticed them to be a little dry and scratchy when you rub them, but I just noticed this yellowish crusting. On her front paws, it takes up like a little less then a quarter of the tip of the pad. Is this normal, or is there anything I can do for it? Or should I have the vet take a look at her?