A heart arrhythmia is a problem with the electrical activity of the heart. If a dog’s heart beats too slowly, it may be said to have bradycardia (slower than 60 beats per minute). If the dog’s heart beats too fast, it may have tachycardia (faster than 160 beats per minute).
The most common type of arrhythmia in dogs is atrial fibrillation, which is an irregular heartbeat. When this happens, blood cannot flow through the chambers of the heart properly and can’t be pumped out to the body. This means that there isn’t enough oxygen reaching your pet’s organs and tissues. Other types of arrhythmias include ventricular fibrillation, ventricular tachycardia, and premature atrial contractions (PACs).