If they do, it could be because they want to feel more like part of the family, or it's just a particular animal's personality and that animal was matched with the person meant for it.
@imbj - Thanks for posting this... any treatments for this in dogs is great and great that there is ongoing research ongoing for all cancer in dogs and humans too!
@AJs:
See, Dan? First you tick everybody off, now you make everybody cry.
But you're still not getting off the hook that easy. You will NOT be banned and in fact will be required to stay. :D
What?! That's it I'm going back to my stupid jokes!