At a guess I would say 3-4 yards as it was a small sample from the dentist. At closer look there is still thread on the the spool so I am not sure if she just ate the plastic or is she ate the plastic and part of the thread. It belongs to my daughter and she thought that she probably used it 1 or 2 times. the last time Lulu got a hold of dental floss she didn't eat any of it just the plastic, So I would guess that if she did manage to get any off the spool it couldn't be more than a yard or 2. Right now she is just active. I took her for a walk and she did "poop." There wasn't anything in it. I just didn't know if there is anything that I should do to try to get her to vomit or poop some more.