[vbayne]

Originally Posted by anko

Did he show any signs of aggression at all?
Also how old is he? If he is still young he might like to chew and chase things.

Or, is it possible that it was an accidental play bite where he was trying to hold on to a person (or their pants), but when when they moved their leg he bit it harder then intended (just because of the motion and a leg slipping out of his mouth).

My pup used to chase my pants when I first got him, but I taught him to loose this habit for good.

Just throwing few ideas your way... It sure does sounds strange..
Try to see if you can catch him in action next time.

Mine does this too. How did you break you pup from doing this?