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I had a similar experience with one of my bassets, as an adult. My vet thought the heart was enlarged, but a veterinary radiologist consultant called it normal size. I think vets sometimes forget bassets are big dogs with big organs, just short legs. You could send the x-ray to a veterinary radiologist for a second opinion. You could also correlate with other signs/symptoms that might also suggest a problem, such as a heart murmur, cough, abnormal lab studies, etc. If the situation continues to be questionable, an echocardiogram (ultrasound exam of the heart) would tell you more specifically whether there's a problem like a malformation. Keep us posted.