How to Listen to a Cat’s Heartbeat With a Stethoscope

To listen to a cat’s heartbeat, place the chest piece of a stethoscope against the left side of the cat’s chest, just behind the bend of the front leg (the elbow), and listen for a rapid, rhythmic “lub-dub” pattern. The technique sounds simple, but cats present unique challenges that dogs and humans do not: they purr involuntarily during handling, their hearts beat faster than you might expect, and pressing too firmly with the stethoscope can actually create sounds that aren’t really there. Understanding the right positioning, handling, and what you’re hearing makes the difference between useful information and noise.

Finding the Right Spot

A cat’s heart sits in the lower portion of the chest, slightly left of center, between roughly the fourth and sixth ribs. The easiest way to find it without counting ribs is to gently lift or draw back the cat’s left front leg and place the stethoscope head against the chest wall right behind where the elbow naturally rests. This area, called the left parasternal region, is where heart sounds are typically loudest.

You should also listen on the right side. Veterinarians routinely auscultate both sides because certain sounds project more clearly to one side than the other. In a large study of 856 cats with heart murmurs, the point of loudest sound was roughly evenly split between the left parasternal area and the sternal or bilateral region, while about a fifth of murmurs were actually loudest on the right side of the chest.¹ So if you only listen on one side, you can miss things.

Use the diaphragm side (the flat, larger surface) of your stethoscope for general heart sounds. If your stethoscope has a bell side (the smaller, concave cup), that can help pick up lower-frequency sounds like gallop rhythms. Have the cat standing, sitting, or lying in a relaxed position on a stable surface. Avoid holding the cat against your own chest, because your heartbeat will interfere with what you hear.

The Purring Problem

Purring is the single biggest obstacle to listening to a cat’s heart. Unlike a dog who might pant or fidget, a cat will often start purring the moment you handle it, and the low-frequency rumble completely drowns out heart sounds. Veterinarians have used various tricks for decades: running a faucet near the cat, waving an alcohol-soaked cotton ball under its nose, or gently blowing on its face. These work inconsistently, and some cats simply purr louder.

A more reliable method described in veterinary research involves gently grasping the cat’s larynx (the throat structure you can feel at the front of the neck) from the underside with one hand while holding the stethoscope with the other.² This gentle grip interrupts the vibration of the laryngeal muscles that produce purring. It does not hurt the cat and doesn’t require sedation. If you’re attempting this at home, be gentle, and if the cat resists, stop. You’ll get a clearer window once purring pauses naturally, even if it’s just a few seconds at a time.

What a Normal Heartbeat Sounds Like

A healthy cat’s heartbeat produces two distinct sounds per cycle, commonly described as “lub-dub.” The first sound (S1) comes from the valves between the upper and lower chambers of the heart snapping shut as the heart contracts. The second sound (S2) comes from the valves at the outflow tracts closing as the heart relaxes. In a normal cat, these two sounds should be crisp and roughly equal in loudness, with a short pause between each pair. The rhythm should sound regular, though slight variation with breathing is normal.

What often surprises people is the speed. A resting cat’s heart rate sits somewhere around 120 to 140 beats per minute in a calm, home environment. That is roughly twice as fast as a resting human heart, and the beats can sound almost like a rapid, light tapping. Count the beats for 15 seconds and multiply by four to get the rate. If the cat is relaxed, you should be able to distinguish each “lub” and “dub” as a pair, but at higher rates the sounds can blur together to an untrained ear.

Why the Setting Changes Everything

One of the most important things to know about feline heart rate is that it changes dramatically depending on where the cat is and how stressed it feels. A study comparing heart rates in the same cats at home and at a veterinary hospital found striking differences: the average heart rate at home was about 132 beats per minute, but in the hospital it climbed to around 187.³ Even when measured with a calm technique inside the hospital, rates still averaged about 150. The sympathetic nervous system drives these increases, meaning the cat’s “fight or flight” response kicks heart rate up substantially.

This matters for you because if you’re listening at home with a calm cat, a rate in the 120s or 130s is perfectly normal, while a rate above 200 in a stressed or recently active cat doesn’t necessarily signal a problem. Conversely, if you consistently hear rates above 200 in a relaxed, resting cat at home, that warrants attention. The home environment gives you an advantage that even your veterinarian doesn’t always have: a truly calm baseline.

Heart Murmurs and What They Mean

A heart murmur is an extra whooshing, blowing, or swishing sound layered over or between the normal “lub-dub.” If you hear one while listening, it can feel alarming, but murmurs in cats are common and frequently do not indicate serious disease. In the large study of 856 cats with detected murmurs, over half had no structural heart abnormality at all when examined with echocardiography.¹ The two most common causes of murmurs in that population were related to temporary blood flow turbulence rather than structural defects.

Murmur loudness is graded on a scale from 1 to 6, where 1 is barely audible and 6 is so loud you can feel it through the chest wall. Most murmurs in cats are soft (grade 1 or 2), and soft systolic murmurs, particularly intermittent ones, are the least likely to be associated with actual cardiac disease.¹ On the other hand, the loudest murmurs, especially those that are continuous (heard throughout the entire heartbeat cycle rather than just during contraction) or that you can feel as a vibration on the chest, were always associated with significant congenital heart disease in that same study. About a quarter of murmurs were described as dynamic, meaning they changed in loudness with changes in heart rate or even with stethoscope pressure.

Older cats deserve special mention. A study of 51 cats with a specific type of right-sided heart turbulence found that most were over four years old and had been brought in for non-cardiac issues like hyperthyroidism, anemia, or kidney disease.⁴ Their murmurs resulted from the right ventricle’s walls briefly coming together during each heartbeat, creating turbulence without any structural damage. This kind of finding is common in middle-aged and older cats and is generally considered physiological rather than pathological.

Don’t Press Too Hard

Here is something that catches even veterinary professionals off guard: pressing the stethoscope too firmly against a cat’s chest can create a murmur that wasn’t there before. Research has shown that gentle pressure with either a stethoscope head or an ultrasound probe against the right side of a cat’s chest can temporarily narrow the right ventricle, causing blood flow turbulence and an audible murmur in a completely healthy animal.⁵ The outflow velocity nearly doubled under provocative pressure in one study, jumping from about 1.05 to 1.94 meters per second, easily enough to generate an audible whoosh.

One study specifically tested this by applying gentle stethoscope pressure to the right chest wall of apparently healthy cats to see whether a murmur would appear.⁶ The takeaway is practical: when you’re listening to your cat at home, hold the stethoscope firmly enough to maintain skin contact and a good seal, but don’t lean into it. Cats have thin, compliant chest walls compared to dogs or humans, and their hearts are closer to the surface. A light touch is all you need, and heavy pressure can literally push the heart’s chamber walls together, generating artifacts.

Gallop Sounds and Other Extra Beats

Beyond murmurs, another abnormal finding you might hear is a gallop rhythm. Instead of the normal two-beat “lub-dub,” a gallop adds a third sound, making the rhythm sound like a horse cantering: “lub-da-dub” or “lub-dub-da.” This third sound comes from either rapid ventricular filling or atrial contraction against a stiff ventricle. Gallops are harder to detect than murmurs, and even experienced veterinarians sometimes miss them.

Gallop sounds can appear in cats with no cardiac disease, particularly in anemic cats. A study comparing anemic cats with non-anemic cats found that about 14% of anemic cats had a gallop, compared with 4% of non-anemic cats.⁷ In severely anemic cats, the blood is essentially thinner and moving faster, which can make these extra sounds appear even without structural heart disease. When anemia is corrected, the gallop often disappears.

A rarer and more specific extra sound has been described in cats with obstructive hypertrophic cardiomyopathy (HCM), the most common form of heart disease in cats. Researchers identified an additional systolic sound occurring between the normal first and second heart sounds, creating a “P-Tam-Ta” rhythm, best heard over the left cranial sternal border.⁸ This sound relates to an abnormal motion of the mitral valve and would be extremely difficult for a non-professional to identify, but it illustrates how much information heart sounds can carry if you know what to listen for.

The Limits of What You Can Hear at Home

Hypertrophic cardiomyopathy is worth understanding because it is the heart condition cat owners most need to worry about, and auscultation alone is not enough to rule it out. HCM thickens the walls of the left ventricle and can lead to heart failure, blood clots, or sudden death. The frustrating reality is that subclinical HCM may or may not produce a heart murmur or gallop sound.⁹ A cat can have significant heart wall thickening and sound completely normal through a stethoscope.

When a murmur is detected, veterinarians use a combination of factors to decide how worried to be. Research on cats with asymptomatic murmurs found that a murmur graded 3 out of 6 or louder, male sex, overweight body condition, and elevated cardiac biomarker levels (a blood test called NT-proBNP) were all independently associated with higher odds of actual cardiac disease.¹⁰ No single factor was definitive on its own, but combining them improved the ability to sort cats who needed echocardiography from those who could be monitored. The practical point: if you hear a soft, intermittent murmur in a young, lean female cat, the odds of serious disease are relatively low. A loud murmur in an overweight older male cat calls for prompt veterinary evaluation.

Electronic and Smartphone Stethoscopes

If you’re considering buying a stethoscope specifically for home use with your cat, you’ll encounter both traditional acoustic models and newer electronic or smartphone-connected devices. Electronic stethoscopes amplify sound and can filter out ambient noise, which sounds ideal for cats. However, a study evaluating a high-end electronic stethoscope (the 3M Littmann Model 3200) in 150 cats found that while it was comparably specific to a conventional stethoscope for detecting abnormal heart sounds, its digital recordings were actually less sensitive.¹¹ In other words, it was good at confirming a sound was there when you heard it live, but its recordings missed some sounds that trained ears could pick up in real time with a conventional stethoscope.

Smartphone-based digital stethoscopes that pair with apps to display phonocardiograms (visual tracings of heart sounds) are a newer option. One study evaluating such a device in dogs and cats found that audio recordings were interpretable in about 90% of animals, with good agreement with conventional auscultation for detecting murmurs and gallop sounds.¹² In nine animals where echocardiography confirmed heart disease, the digital stethoscope actually detected murmurs or gallops that conventional auscultation missed. These devices can be useful for home monitoring because they create recordings you can share with your veterinarian, which is far more actionable than trying to describe a sound over the phone.

Calming an Anxious Cat for a Cardiac Exam

Stress doesn’t just raise heart rate. A tense, squirming cat is nearly impossible to auscultate properly, and the muscle trembling and heavy breathing introduce so much artifact that even experienced clinicians struggle. For veterinary visits specifically, pre-visit calming medication can help. A randomized trial found that a single oral dose of gabapentin (100 mg) or melatonin (3 mg) given an hour before a cardiac evaluation significantly improved the cats’ compliance without interfering with heart rate, blood pressure, or echocardiographic measurements.¹³ Gabapentin in particular produced noticeable tranquilization. This is worth discussing with your vet if your cat becomes extremely stressed during visits, because a calmer cat yields a more accurate cardiac exam without the drugs muddying the cardiovascular findings.

At home, the bar is lower. Most cats will tolerate a brief stethoscope session if you catch them during a rest period, keep the room quiet, and avoid restraining them tightly. Warming the stethoscope chest piece in your hand for 30 seconds before placing it on the cat helps too. Cold metal on warm fur tends to trigger an immediate flinch and, predictably, more purring.

Anemia, Hyperthyroidism, and Other Non-Cardiac Causes of Strange Sounds

Not every abnormal heart sound comes from a heart problem. Anemia is one of the more common non-cardiac culprits. When a cat’s red blood cell count drops, blood flows faster and more turbulently through normal-sized vessels and chambers, producing murmurs and sometimes gallops. In the anemia study mentioned earlier, about 30% of anemic cats had a murmur compared to 11% of non-anemic cats, and the proportion increased further in cats with severe anemia.⁷ When echocardiography was performed on anemic cats with murmurs, several had normal hearts aside from chamber dilation consistent with the anemia itself.

Hyperthyroidism, another common condition in older cats, also creates high cardiac output that can produce or worsen murmurs. The earlier study of dynamic right ventricular obstruction found that hyperthyroidism, anemia, inflammatory disease, and chronic kidney disease were all associated with the appearance of murmurs in cats who had no structural heart abnormality.⁴ Treating the underlying condition often resolves or reduces the murmur. This is a good reason not to panic if you hear something unusual through your stethoscope. It might be the heart, or it might be the blood, or it might even be the stethoscope pressure. Context and follow-up matter far more than a single auscultation session.

1
PubMed Central. Prevalence and Clinical Significance of Heart Murmurs Detected on Cardiac Auscultation in 856 Cats
2
PubMed Central. A New, Easy-to-Learn, Fear-Free Method to Stop Purring During Cardiac Auscultation in Cats
3
PubMed Central. Heart rate and heart rate variability of healthy cats in home and hospital environments
4
PubMed. Dynamic right ventricular outflow obstruction: a new cause of systolic murmurs in cats
5
PubMed Central. Heart murmurs in apparently healthy cats caused by iatrogenic dynamic right ventricular outflow tract obstruction
6
PubMed. Prevalence of iatrogenic heart murmurs in a population of apparently healthy cats
7
Journal of Veterinary Emergency and Critical Care. The prevalence of murmurs and gallop sounds in anemic cats
8
PubMed Central. Systolic third sound associated with systolic anterior motion of the mitral valve in cats with obstructive hypertrophic cardiomyopathy
9
PubMed Central. The Feline Cardiomyopathies: 2. Hypertrophic cardiomyopathy
10
Journal of Veterinary Internal Medicine. Accuracy of combined signalment, physical examination and cardiac biomarkers in screening cats with asymptomatic murmurs for cardiac disease
11
PubMed Central. Clinical evaluation of the 3M Littmann Electronic Stethoscope Model 3200 in 150 cats
12
PubMed. Evaluation of a new smartphone-based digital stethoscope featuring phonocardiography and electrocardiography in dogs and cats
13
PubMed Central. Behavioral and cardiovascular effects of a single dose of gabapentin or melatonin in cats