At what age do puppies start "teething"? Reese has been chewing on EVERYTHING other than her toys today and i started wondering if she is losing her baby teeth and the others are coming up. I mean she is eating leaves out of the yard, chewing and licking on my couch/the floor and apparently even managed to eat a few stings of the funny white stuff that is on the underside of a couch. She ended up barfing up everything and i found green and black string (thread from my actual couch) and then colored strings from one of her rope toys. I couldnt remember at what age this typically started at though and she just turned 9 month. I also am wondering how long this lasts, i mean it drove me nuts today having to tell her every 2 seconds to leave it and give her a toy...just for her to ignore the toy and go right back to trying to eat my couch!!