Heart Murmurs in Welsh Springer Spaniels: What That Vet Visit Comment Actually Means

Vets grade murmurs on a scale from one to six based on how loud and easily detectable the sound is, not directly on how dangerous the underlying cause is, though the two often correlate loosely. A grade one or two murmur is soft and can be easy to miss even for an experienced listener, while a grade five or six is loud enough to feel as a vibration through the chest wall.

In puppies, a soft murmur detected before around four to six months of age is sometimes called an innocent murmur, a temporary sound related to a rapidly developing cardiovascular system that often disappears entirely as the puppy matures, with no lasting significance at all. This is different from a murmur that persists past that early window or one that appears newly in an adult or senior dog, which is more likely to reflect an actual structural change, most often in a heart valve, and warrants further investigation.

The grade alone does not tell the whole story, which is why a vet detecting any murmur beyond the innocent puppy window typically recommends an echocardiogram, an ultrasound of the heart, to see exactly what's happening rather than guessing from sound alone. This single imaging step is what turns a vague 'there's a murmur' into an actual answer about whether anything needs monitoring or treatment.

A murmur finding calls for a clear next step, not alarm, and knowing the right questions to ask turns an uncertain moment into a concrete plan.