My Paddy passed away 3 years ago from the same problem
he had the same meds as you are using, when first diagnosed the xray showed as yours that the enlarged heart was pressing his trachea against his spine,he also had an enlarged liver, some other meds for that.
With careful medication and care he lived a fruitfull two more years before passing away at the grand age of 14.
While it was sad to lose him, I am so glad we never had him put to sleep as he enjoyed his time with us so much, the vet warned me it would be expensive, my attitude was, you are not putting my best mate to sleep and so we had a couple more years with each other, he eventually died of heart failure in my arms.
God bless you Paddy, never forgotten my little friend. |