Electrocardiogram (ECG/EKG)
A brief recording of the heart's electrical activity. Shows heart rhythm and can detect arrhythmias, conduction abnormalities, and chamber enlargement patterns.
What it measures
Heart rate, rhythm regularity, P wave morphology (atrial activity), QRS complex (ventricular activity), T wave, and intervals between electrical events. Can detect atrial fibrillation, ventricular premature complexes, conduction blocks, and patterns suggesting chamber enlargement. Unlike a Holter monitor, an ECG captures only a brief snapshot (seconds to minutes) rather than 24 hours.
What to expect
Your dog lies on their right side on a padded surface. Small clips or adhesive patches are attached to each leg and sometimes the chest. The recording takes 1-5 minutes. Completely painless. No sedation needed. Results are available immediately. Often done as part of a cardiac workup alongside an echocardiogram.
Typical cost
$50-150. Often included as part of a cardiology consultation or pre-anesthetic screening.
How often
As part of initial cardiac workup. Pre-anesthetic screening before surgery. When arrhythmia is suspected. Less useful than Holter monitoring for intermittent arrhythmias since it only captures a brief window.
Conditions detected
Breeds that need this test
Need to schedule a ecg?
Find a board-certified veterinary cardiologist near you who can perform this test and interpret the results.
Find a cardiologist →Medical disclaimer: Heart Dog Club provides educational information only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian or board-certified veterinary cardiologist (DACVIM-Cardiology) regarding your dog's health.