Collapsing trachea

We have followed you CA Poppy since we rescued Miss Petunia, the Chi, and you have helped us in so many ways with your sharing. She is now refusing to go down the steps for her evening 'potty walks', and today snapped at David. But we do want to wait a couple more weeks before talking with a Vet .. just so hard to watch her coughing, and trying to get her breath, plus she is getting '*****y' and snapped at DH today. She has had a good life with us since 2006, and we need to do what is best for her. Just hope we can find a vet willing to do as we wish for her.