Faxing x-rays to a specialist is not going to be sufficient. To save money in the long run, have a cardiologist examine your dog. You will find out for sure what is going on, if anything is going on.
Like Momo's momma, we spent about $1100 to have Barney have some pretty xrays done and other waste of money testing only to get the advice "well he's fine just watch him". He actually had a respiratory infection and we discovered the "enlarged heart" while checking out his heart and lungs for his cough. The telephone specialist wrote a fancy report that talked about my dog's stomach lining being of "grave concern" and when I rushed him to the internist with a specialty in digestive issues, I was quickly reassured.
I hope you can find a cardiologist in your area. Good luck and keep us posted. Here's a link you might find helpful:
Board Certified Veterinary Cardiologists