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Dog and Cat EKG: Recording Electrocardiograms in Humans’ Favorite Companions

dog and cat ekg
“You gonna take dat signal from my toys too?”

— Written by Tim Marzullo —

All vertebrate animals have hearts (and many invertebrates too), and many have EKGs that can be non-invasively recorded as commonly done in humans. We have fairly hairless bodies, so we can easily put sticker electrodes on our wrists or chests to record our EKG. 

However, many of us share our households with furry four-legged creatures that bring us joy, companionship, humor, protection and pest control. Could we record their EKGs too? We know that the smaller the mammal, the faster the heart rate, but can we see this trend in our own pets, and in a way that minimally annoys our household friends? Yes we can. Ladies and gentlemen, the Dog and Cat EKG.


For our dog EKG investigations, we chose a two-year-old Vizsla dog named “Santina”, cared for by BYBer Florencia Edwards. This dog has very short hair and a gentle disposition, making it ideal for our pilot experiments. We modified our EEG headband by using tennis wristbands instead, inserting metal buttons into the wristbands (the buttons we find in jeans and wallets), and slipped them on her front two legs (signal electrodes), and one rear leg (ground). 


How the SpikerBox Revolutionized K12 STEM Education… and just what is a SpikerBox?

How the SpikerBox Revolutionized K12 STEM Education…

and just what is a SpikerBox?

Backyard Brains exists today because of a once-lofty goal: To turn a $40,000+ rack of graduate-level electronics into a $100 kit that students could use in the classroom to perform real, hands-on neuroscience experiments. A decade later, we have developed four lines of products that can get you involved in many aspects of neuroscience!

Enter the SpikerBox! SpikerBoxes are our name for the educational electronics we developed, a low-cost bioamplifier that can record “spikes,” or action potentials. Spikes are the universal signals which bring life to thought, sensation, movement, behavior, actions, reactions… everything that makes us living creatures!

The SpikerBox:
Students say Yes to Neuroscience!

Thanks to SpikerBoxes, more than 45,000 people have seen real, live action potentials, either from their own body, somebody else’s, or from an insect or plant! And those are just the people we’ve counted… Since we began shipping in 2009, nearly 13,000 SpikerBoxes have hit the streets, bringing neuroscience to students, hobbyists, and researchers on every continent and in over 80 countries (Recently, we sent our first kit ever to Cyprus!)

Teachers we work with are excited to bring hands-on science experiments into the classroom. We offer free educational materials that pair with all of our kits, and we are developing curricula to help bring neuroscience into specific programs like Next Generation Science Standards and Project Lead The Way! Coming soon, we are expanding our Teacher Portal to help you share Backyard Brains with your students. In addition, we developed a free, open-source spike recording software (Called… you guessed it, SpikeRecorder) that lets you use the tech you already have (Chromebooks, iPads, PC, Android Phones) to record and analyze the signals your SpikerBox is recording. Our SpikerBoxes come in a few flavors, depending on the signal you want to read.

The Neuron SpikerBox

First off, the Neuron SpikerBox. This is the SpikerBox that launched 10,000 ships. Our O.G. product. Before we were a company, we were simply a goal: to create an affordable neuroscience kit to increase accessibility for younger learners, and that goal manifested itself as the Neuron SpikerBox. It allows students to record from the nervous systems of invertebrates, like cockroaches, crickets, and grasshoppers, and perform experiments to learn about how neurons and the nervous system work.

It is also an important segue into using animal models and model organisms to learn about our own nervous systems! We wouldn’t have models without model organisms, as many developments in neuroscience were made by studying the nervous systems of invertebrates and other, relatively “simple,” organisms. It is also an opportunity to talk about ethics: our cockroach prep for the Neuron SpikerBox is non-lethal, but it is invasive. A good conversation to have with any budding scientist is the measured, societal cost-benefit analysis of doing experiments like these.

What can a student learn by performing experiments with the Neuron SpikerBox? They will learn about neurons, action potentials, and how these spikes of electricity become meaningful signals to the organisms in which they are present.

Our Neuron SpikerBox is a fantastic learning tool, but it is also a powerful research tool. We have published several scientific articles featuring data which we recorded from grasshoppers, dragonflies, and other creatures using our Neuron SpikerBox.

The Muscle SpikerBox

After we perfected our bioamplifier for model organisms, we wanted to get a little more personal. After all, what better way to learn about science than to learn how your own body works? The Muscle SpikerBox records spikes in the form of Electromyograms (EMGs). EMGs are recordings of the electrical activity in our muscles! When our brain sends a signal to our muscles to move, there is an electrical synapse where the nerve meets the muscle, and our sensors record that! Used in medicine, sports science, and physiology, EMGs are an exciting way to introduce students to practical science where they are the experiment! For example, a great first experiment is recording varying rates of muscle fatigue. In fact, we had a fifth grader win her district Science Fair by comparing muscle fatigue between her left and right arms!

The Heart and Brain SpikerBox

This SpikerBox gets to the real heart of Neuroscience. It is a multi-functional bioamplifier that focuses on your involuntary nervous system, the automatic responses that keep us going. The heartbeat is the electrical signal that most students are already familiar with through pop culture. Many of them could roughly draw what a heartbeat signal should look like, and they know a flatline is, well, very bad. Drawing from this intuitive knowledge, it’s exciting to show students their heart rates, explain to them what exactly that spikey shape they’ve seen on TV means, and teach them about the electrical impulses which keep our pulse up.

Then, there is the Brain. With this dual-function SpikerBox, you can have students see and experiment with their actual brain waves or Electroencephalograms (EEGs). No, I’m not talking about EMG artefacts or some cheesy “Brain Power” game. Our intro experiment with this kit has students see the activity of their vision center, the occipital lobe. When your eyes are open, they are processing a lot of activity, but when they are closed, that part of the brain calms down. Here we can see Alpha Waves, kind of like the brain’s “on-hold” pattern, emerge. Our co-founders never saw EEG in real life until after they had already received their doctorates. Just let that sink in. Elementary schoolers today have access to tech that was too inconvenient to demonstrate to graduate students just several years ago! Talk about a NeuroRevolution!

The Plant SpikerBox

Finally, we have our SpikerBox that is harnessing the power of electrophysiology in uncharted territory: plants! When we ask students about what makes us alive, many answer “brains.” When asked to expand on that, many say the fact that we can move around. But what about the Venus Flytrap, a plant that can move in response to stimulation, without an ostensible brain? With this SpikerBox we can unlock the secret electrical language used in plants, demonstrating fundamental neuroscience principles in an unconventional model organism, and spreading the wonder of understanding how living creatures work!


The SpikerBoxes are our way of making advanced neuroscience accessible to the masses. To facilitate this and to cut user costs, all of our experiments, software, and educational materials are available for free! Check out our experiments and figure out which SpikerBox is right for you, your classroom, or your backyard science lab! What will you discover?

MATLAB <3 BYB + Arduino

Why buy, when you can build? Madhu Govindarajan of MathWorks recently used one of our old products to make his very own heart rate detector. The Heart & Brain SpikerShield (recently replaced by our Heart and Brain SpikerBox) was designed to help the user view and record the action potentials of their heart easily, and Madhu has harnessed this basic concept to create his own heart rate detector.

In the demo, Madhu explains how to use the MATLAB and Simulink programs to filter the raw ECG, compute the heart rate value, and display it on a thin-film-transistor LCD screen (very high resolution, with a transistor for each pixel), called a TFT screen. The actual TFT screen is available here, and Madhu’s team used the libraries available as well as their own custom modifications to create a recognizable ECG display. Sounds very BYB, if we do say so ourselves.

MATLAB (matrix laboratory) is a programming language developed by MathWorks used by neuroscientists and engineers alike to do a lot of data analysis. It’s a powerful tool that pairs nicely with open source gear like ours, and there are accessible versions available to young coders for learning and development. This example is a higher-level high school or undergrad experiment, and we are excited to see ways in which we can expand use for the high school level! For more information on using MATLAB in schools, check out this Mathworks webpage.

MathWorker Tom Bryan primarily worked on the signal processing code behind the video, and he had this to say about our work: “BYB will be my go-to for neuroscience hardware from now on, because they are the only reliable company making good products.” Thanks for the high praise, Tom!

We love to hear your stories. If you have done something cool with our gear, drop us a note at to brag about it a little!