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My cat has uneven pupils and a heart murmur. What symptoms should I watch for?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 6 months and 12 days old | 2 lbs

Noticed Mario’s pupil in the right eye bigger than in the left. Took him to the vet. He heard some noise in his heart, said on the scale of 6 it’s a 3. We should do an X-ray to rule out enlarged heart but cannot afford it at the moment. What would be the symptoms to watch out for? Like, he’s panting after running after toy with feathers and I was told that’s one of the possible simpoms.

1 Answer

Most Helpful Answer

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Answered By Maria DVM

Veterinarian

Published on January 19th, 2019

There sounds like there are two different things going on with Mario. His eye I would recommend having the pressures checked to make sure he does not have glaucoma but I would also recommend an ophthalmologist to determine the cause. Heart disease can be seen as coughing or fainting They can have panting or they may have no symptoms. I would actually recommend an echocardiogram over an x-ray. Cats typically get Hypertrophic Cardiomyopathy. This is when the heart thickens from the outside in. This means we will most likely not see an enlarged heart on x-ray. An echocardiogram is more expensive but the better test. I would monitor for fainting, coughing or exercise intolerance. The painting may be heart-related but I cannot say for sure without more diagnostics.

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