I have just found out that my 3month old puppy has an enlarged heart which is piercing through her small rib cage. The X-ray shows what looks like her heart pressing her rib cage. What can be done for this if anything?

I don't like to second guess a Veterinarian, particularly a specialist. Has your local Vet recommended a specialist, perhaps a Vet School?

You must be devastated!

What breed?