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First, this is a pretty common problem in small breeds, and can be very dramatic to watch. The problem is aggrevated by a dog being overweight, allergies, smoker in the house, etc. There are some medications that help should you want to try those as well.
There is also a surgery where they place a device in the trachea that helps keep it open...you would need to be referred to a veterinary surgeon for that...and is a valid option since your dog is so young and can easily live another 12 years.
I just went on to Google.com and typed in Collapsing Trachea in a Dog. It came up with several explanations and graphics that were wonderful, like the one below
As well as a description of the surgery. Keep in mind your vet has to diagnose whether the collapse is in the neck or chest region, surgery is usually not a valid option if the collapse is within the chest.
Take the time to look at some sites...and if you need clarification or have new questions, let me know.