Hey - the brother of one of my yorkies also has a collapsed trachea. He was taken to U. of P. and spent a few days there. His mom was told that stress will make it worse. I know he is on meds, too. They do offer the best stent surgeons in the area. I would keep a a close eye on your little one. I know I drive my vet crazy but we DO know our dogs better than they do. Your little one will be in our prayers.
