All kinds of health conditions can affect our dogs, from treatment-defying cancer to patience-testing dermatitis to nobody-to-blame-but-myself parasites. But somehow, when the heart is involved, it strikes us to our core. So, we thought we’d take a look at one of the more troubling potential signs of heart problems – murmurs. It’s one of those words that make dog lovers draw in a quick breath and immediately start imagining the worst.