Skip to main content
Cat resting on a chair

Heart disease in cats

Q: During our cat’s last wellness visit, the veterinarian detected a heart murmur he hadn’t heard in the past. He recommended Gus, our 5-year-old cat, see a veterinary cardiologist, but we can’t afford that.

Our vet is concerned that Gus may have a type of heart disease called HCM and throw a clot that would cause a problem with his hind legs. How will we know if this happens?

A: HCM, or hypertrophic cardiomyopathy, the most common heart condition in cats, is associated with thromboembolism.

A thromboembolism is a blood clot that forms in the heart and travels through the blood vessels. In Greek, “thrombo-“ means clot, and “-embolism” means “to throw in.”

In cats, the clot often lodges at the junction where the blood vessels branch into the rear legs. Because of the location, this clot is called a saddle thromboembolism. It blocks blood flow to both back legs, although sometimes one leg is more severely affected than the other. The lack of blood results in pain and diminished muscle function.

If Gus develops a saddle thromboembolism, he won’t be able to walk on his back legs and he’ll cry in pain. His hind paws will be cooler than his front paws, and his hind pads will be paler than his front pads.

This condition is so painful that it is essential to get Gus to your veterinarian or an emergency clinic immediately. Successful treatment of saddle thromboembolism is rare, so you should be prepared to make a difficult decision.

Lee Pickett, V.M.D. practices companion animal medicine. Contact her at

Protect your pet from the unexpected with Figo Pet Insurance, rated “Best Pet Insurance” by since 2017.

Calico Cat napping on bed

When it comes to traditional Pet...

Senior owner with dog at vet

Keeping tails wagging and cats purring...

Advertisement for pet insurance.

More From Figo Blog
Scarf'd Pet Recipes, Mini Pup-kin Pies

Picture this: your freshly baked pumpkin pie...

man working on laptop in coffee shop with a dog in his lap

September 29th is #NationalCoffeeDay, and we...

Labrador Retriever retrieving a blue frisbee from the yard

One of the best things about owning a dog is...

Cat scratching on a cat post

You may have heard the phrase, “Cats can’t...

Dog and pet parent listening to music in front of speaker

Whether you’re rocking out to your favorite...

Gift guide of holiday pet products

Season's greetings! It's time once again to...

Woman drinking coffee and holding small cat near

On any given day, between 50 and 70 million...

Woman with dog looking at tablet

Since 2017 Americans have spent between $17...