Enlarged heart or Collapsing Trachea

Question
In 2000 my dog experienced difficulty breathing due to fluid in lungs. An x-ray was taken and it was determined he had an enlarged heart (heart has no murmur present). He was placed on Enalpril and Lasix by Vet A.  My dog has experience some more prevalant signs of collapsing trachea.  Vet B diagnosed collapsing trachea and when looking at all of my dogs past x-rays determined his heart is of normal size. Since a murmur is not present, Vet B feels dog does not have a heart problem and the fluid retention was probably due to the collapsing trachea. (he is experiencing the tracheal collapse in the chest cavity & cannot breath out) He prescribed a brochialdilator and to start decreasing the Enalpril gradually. My  8-9lb dog was on Enalpril twice daily.  Both vets make perfect sense in their explanations, but how can I determine if taking my dog off of enalpril is the right answer?  

Answer
Jennifer,

You should take your dog to a vet. cardiologist and have an echocardiogram done.  (Your vet should be able to get you a referral.)  This will determine if there is any heart disease and if enalapril is needed or not.  The cardiologist will ultrasound the chambers of the heart, measure the walls of the heart, inspect the valves and blood flow.

Good Luck,
Dr. Fry