My friend's Teddy dog, with congenital tracheal stenosis, was only recently discovered, and he was particularly short of breath. Is there a low-risk treatment?

If you don't have surgery, there is no such big risk. If you can control it, try to control it as much as possible. Congenital is a bit difficult. My dog's tracheal stenosis is caused by heart disease, and now he is taking rejuvenating treatment according to his dreams. Don't irritate him at ordinary times, and refuse food with high oil and salt. Mitigation and prevention outweigh treatment.