Sadly, we learnt about tracheal collapse as our older rescue Sailor had the condition. It is a tough one, his final days were so sad, it is an awful condition that we struggled with him for years until we were no longer able to keep him comfortable. We were blessed to have him until his 12th year.
The experience with Sailor really taught us about the trachea and we decided that we would always keep an eye out for any sign of tracheal issues in our Chin and immediately spay/neuter if we saw anything. Do not let anyone tell you this is a minor issue!
The following is an excellent link that explains tracheal collapse well:
a little of everything
We are continually learning about Chin, as we do so we will share our findings and provide links to interesting articles, etc. on this blog.