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Mitral valve disease: the murmur an old dog never outgrew

Time:2026-09-14   Number of visits:1010

The murmur showed up at a routine check, in a dog who had slowed down so gently I called it age. My old spaniel, Juno, was twelve and a little less keen on the long field, and I had written it off as winter. The stethoscope said otherwise. A heart murmur, and behind it, mitral valve disease.

The mitral valve sits between two chambers on the left side of the heart. In many older small dogs it wears and leaks, letting blood slip backward with a whoosh the vet hears as a murmur. The leak grows over years, the heart works harder, and eventually fluid can back up into the lungs. That last stage is the one to head off.

Juno's was a soft murmur at first, grade two, and the vet said watch, not worry. We rechecked every six months. The leak crept up, the breath got shorter on hills, and at grade four we started a small daily tablet to lighten the load. She perked up within a fortnight, which told me how much she had been quietly carrying.

The signs to notice are soft. A dog that lags on the walk it used to lead. A cough at night, when the fluid shifts as she lies down. A rest after stairs that used to be nothing. None of these shout. They whisper, and you have to be listening.

Living with a leaky valve

Management is mostly routine. The tablet, a weigh-in, and a calm pace. Juno still walks, just shorter, and still retrieves, just the gentle throws. The vet listens every few months and adjusts. The disease is chronic, not a crisis, and a steady hand keeps it that way for a long time.

Weight is the quiet lever. An extra kilo is extra work for a leaking valve, so Juno's treats shrank and her dinner is measured to the gram. She protests. The valve does not care.

Know the red flags. A sudden cough that will not settle, breathing that looks like effort even at rest, gums that turn grey, a collapse. Those mean the fluid has tipped into the lungs and it is an emergency, not a Tuesday. I keep the clinic number where I can find it in the dark.

Juno is still with me, still tail-up, two years after the murmur turned into treatment. Mitral valve disease is common in old small dogs and it is not a death sentence the day it is heard. Catch it early, medicate the load, watch the breath, and your dog can have a long, good run yet. Juno intends to.

The six-month listen became a rhythm, and Juno learned that the weigh-in means a treat, not a fuss. The murmur crept up slowly and the tablet came on early, which the vet said was the difference between a managed valve and a crisis. Catching it at a routine check, before the cough, bought her the easy years.

We changed the walks rather than the life. Shorter, softer, more often, and the retrieve became gentle tosses instead of long sprints. Juno did not notice the edit; she noticed the treat after and the nap after that. A senior dog with a leaky valve keeps most of her joys if you hand them to her at a pace the heart can pay for.

The night cough is the alarm I watch for, the one that means fluid is shifting as she lies down. We are not there, and the plan is to stay not-there with the medicine and the scale and the calm. Mitral valve disease is a sentence pronounced softly in old age, not a verdict. Juno and I intend to outwalk the worry, one short walk at a time.

The tablet is tiny and daily and ordinary now, and Juno takes it in a bit of cheese without a thought. The murmur we caught early stays managed, the breath stays easy, and the walks stay short and sweet. A leaking valve is a chronic thing, not a crisis, when you meet it with a scale and a prescription and a calm hand.

The night cough has not come, and the plan is to keep it that way. Mitral valve disease in an old small dog is common and, caught in time, slow. Juno and I take the short walks, weigh the food, and listen for the breath that would mean trouble. So far, just a tail up and a steady pace, and that is the win.

The years stacked up well. Juno is past the age the murmur first showed and still leads the short walks, still retrieves the gentle throws, still sleeps at the foot of the bed. Mitral valve disease is a sentence pronounced softly in old age, not a verdict. Medicine, a scale, a calm pace, and a watchful ear kept the years on the table, and that is the whole strategy.

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