I'd assume treatment varies based on the severity of the condition & the age of the dog. Your dog's vet is your best resource for information & prognosis. Medication, such as corticosteriods & cough suppressants, can ease the breathing difficulties & hacking episodes, but doesn't correct the problem.
I'll relate my experience with my own yorkie in the hopes that it may be of some benefit to you
My last yorkie, Chelsea, was diagnosed with CT at about 1 1/2 years of age. Her condition was not severe at that time & symptoms could be minimized through behavior modification,
training her to stay calm & not allowing her to becoming over-excited, etc. It was also important to keep her a
very healthy weight & well exercised, as the disease affects the heart & lungs as it progresses and you want a good foundation to begin with.
It was not until many years later that her breathing got noticeably worse and her stance changed. It wasn't until the last few years that she was put on prednisone. She went down hill very quickly at the end (from slight breathing difficult, to gasping for air) in less than a month and had to be to put sleep.
Chelsea lived to be 11 1/2 years old and for over 11 of those years she was happy & active and loved running & playing with my kids. My kids were 5 & 3 when we got her and she didn't pass away until the start of my daughter's senior year in high school.