My dog has recently decided to start eating metal. This worries me a little. She has eaten, or at least chewed off, zippers on pants, the zipper on my bag, some A/V cables, staples in a wall, and the list goes on. Interestingly, she does not simply chew on whatever happens to be lying around, she actively seeks out new metal to eat. Earlier today she knocked a container of small nails off a table and was attempting to lick them up when I caught her. Even now, somewhere in the depths of the apartment, I can hear her chewing. I am not sure why she does this, we give her vitamin supplements that have iron, so I don't think that is the problem. Anyone have ideas?