Increased heart rate (tachycardia) in Dogs
When to visit the vet?
Urgent see a veterinarian within 24 hours
RED for pale mucous membranes, weak pulse, prolonged CRT, dyspnea, collapse/syncope, persistent severe Bleeding, abdominal distension (suspected GDV), or suspected shock.
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Definition
An increased heart rate, also known as tachycardia, describes a condition in which a dog’s heart beats faster than normal. This can be a sign of various health problems, some of which can be serious.
Can Occur with the Following Diseases:
- Twisted Intestine in Dogs (Intestinal Volvulus)
- Congenital Leakage of a Heart Valve in Dogs (Tricuspid Valve Insufficiency)
- Heart Muscle Inflammation After Injury in Dogs (Traumatic Myocarditis)
- Heart Muscle Disease in Boxer Dogs (Arrhythmogenic Right Ventricular Cardiomyopathy, ARVC)
- Hole Between the Lower Heart Chambers in Dogs (Ventricular Septal Defect, VSD)
- Heart Rhythm Disorder from an Extra Electrical Pathway in Dogs (Wolff-Parkinson-White Syndrome, WPW)
- Bacterial Bloodstream Infection in Dogs (Septicemia and Bacteremia)
- Life-Threatening Shock from Severe Infection in Dogs (Septic Shock)
- Spontaneous Tear in an Artery Supplying the Heart in Dogs (Spontaneous Coronary Artery Dissection)
- Narrowing at the Heart's Outlet to the Lungs in Dogs (Pulmonic Stenosis)
- High Blood Pressure in the Lung Vessels in Dogs (Pulmonary Hypertension, PH)
- Fluid Around the Heart in Dogs (Pericardial Effusion)
- Sunken Chest in Dogs (Pectus Excavatum)
- Parvo in Dogs (Canine Parvovirus Infection)
- Inflammation of the Heart Sac in Dogs (Pericarditis)
- Birth Defect Linking the Abdomen and Heart Sac in Dogs (Peritoneopericardial Diaphragmatic Hernia, PPDH)
- Persistent Fetal Heart Vessel in Dogs (Patent Ductus Arteriosus, PDA)
- Torn Heart Muscle in Dogs (Myocardial Rupture)
- Heart Muscle Inflammation in Dogs (Myocarditis)
- Heart Attack in Dogs (Myocardial Infarction)
- Reduced Blood Oxygen Delivery in Dogs (Methemoglobinemia)
- Shock from Low Circulating Blood Volume in Dogs (Hypovolemic Shock)
- Red Blood Cell Destruction After a Transfusion in Dogs (Hemolytic Transfusion Reaction, HTR)
- Ruptured Spleen in Dogs (Splenic Rupture)
- Twisted Spleen in Dogs (Splenic Torsion)
- Drug-Resistant Staph Infection in Dogs (Methicillin-Resistant Staphylococcus aureus Infection, MRSA)
- Blood Clots in the Lungs in Dogs (Pulmonary Thromboembolism, PTE)
- Blood in the Chest Cavity in Dogs (Hemothorax)
- Blood Vessel Cancer of the Liver and Spleen in Dogs (Hepatic and Splenic Hemangiosarcoma)
- Widespread Abnormal Blood Clotting in Dogs (Disseminated Intravascular Coagulation, DIC)
- Degenerative Heart Valve Disease in Dogs (Myxomatous Atrioventricular Valve Degeneration, Endocardiosis)
- Voice Box Spasm in Dogs (Laryngospasm)
- Loss of Body Water in Dogs (Dehydration)
- E. coli Infection in Dogs (Colibacillosis)
- Complex Heart Defect Present at Birth in Dogs (Tetralogy of Fallot)
- Abdominal Inflammation from Leaking Bile in Dogs (Bile Peritonitis)
- Abdominal Organs Herniating into the Chest in Dogs (Diaphragmatic Hernia)
- Abnormal Heart Rhythm in Dogs (Cardiac Arrhythmias)
- Thickened Heart Muscle in Dogs (Hypertrophic Cardiomyopathy, HCM)
- Overactive Thyroid Gland in Dogs (Hyperthyroidism)
- Severe Overheating in Dogs (Heatstroke)
- Staph Infections in Dogs (Staphylococcal Infections)
- Shock from Heart Pump Failure in Dogs (Cardiogenic Shock)
- Enlarged and Weakened Heart in Dogs (Dilated Cardiomyopathy, DCM)
- Digoxin Poisoning in Dogs (Digoxin Toxicosis)
- Acute Severe Lung Failure in Dogs (Acute Respiratory Distress Syndrome, ARDS)
- Abnormal Connection Between an Artery and a Vein in Dogs (Arteriovenous Fistula)
- Severe Allergic Reaction in Dogs (Anaphylaxis)
- Leaky Heart Valves in Dogs (Myxomatous Atrioventricular Valve Degeneration, Endocardiosis)
- Fluid Buildup in the Abdomen in Dogs (Ascites)
- Babesia Parasite Infection in Dogs (Babesiosis)
- Cold-Triggered Anemia in Dogs (Cold Agglutinin Disease)
- Candida Yeast Infection in Dogs (Candidiasis)
- Bile Duct Cancer in Dogs (Cholangiocarcinoma)
- Sudden Loss of Kidney Function in Dogs (Acute Kidney Injury, AKI)
- Sudden Severe Bloody Diarrhea in Dogs (Acute Hemorrhagic Diarrhea Syndrome, AHDS)
- Bloat with a Twisted Stomach in Dogs (Gastric Dilatation-Volvulus, GDV)
Basics and possible causes
A dog’s heart rate can be influenced by various physiological and pathological conditions. Physiologically, heart rate can be increased due to stress, excitement, or physical exertion. Pathologically, however, an increased heart rate can indicate problems such as heart disease, metabolic disorders, or infection.
Tachycardia can be triggered by a variety of factors. Common causes include heart diseases such as heart valve defects or cardiomyopathy. These conditions impair the heart’s ability to pump efficiently, leading to a compensatory increase in heart rate.
Extracardiac causes, such as endocrine disorders (e.g., hyperthyroidism), can also play a role. Such hormonal imbalances can accelerate the dog’s metabolism and lead to an increased heart rate.
Infection and Fever are other possible causes of tachycardia in dogs. The body can respond to an infection with an increased heart rate to improve blood circulation and thus the supply of immune cells and nutrients.
Finally, certain medications or toxins can also lead to an increased heart rate. Some medications commonly prescribed to dogs have tachycardia as a side effect. Similarly, toxins from the environment or certain foods can affect the heart.
Typical accompanying symptoms
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Dyspnea: Dogs with tachycardia may have difficulty breathing as the heart tries to pump more oxygen through the body.
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Weakness or lethargy: A persistently increased heart rate can lead to fatigue because the body uses more energy.
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Cough: Especially with heart problems, a cough can be an accompanying symptom because fluid can get into the lungs.
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Fainting or collapse: In severe cases, the blood supply to the brain may be insufficient, which can lead to loss of consciousness.
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Pale or bluish gums: This may indicate an insufficient oxygen supply caused by ineffective heart function.
When to visit the vet?
A veterinary visit is urgently required if the increased heart rate is accompanied by severe symptoms such as fainting, severe Cough, or dyspnea. Even if symptoms appear suddenly and without apparent reason, quick action is important.
Even with less acute symptoms, a veterinarian should be consulted if the tachycardia persists for a longer period or worsens. Early diagnosis can help prevent more serious complications.
In cases where the dog has a known heart condition, regular monitoring of the heart rate and close cooperation with the veterinarian are crucial to monitor the health status and adjust the treatment if necessary.
Symptom recognition for animal owners and veterinary diagnostic procedures
Pet owners can measure their dog’s heart rate by feeling the pulse on the inside of the thigh or on the chest. A normal heart rate varies depending on the dog’s size and breed, but typically ranges from 60 to 140 beats per minute.
The veterinarian will likely perform a comprehensive physical examination, which includes listening to the heart with a stethoscope to detect heart murmurs or irregularities.
Further diagnosis may involve blood tests, X-rays, ultrasound examinations of the heart (echocardiography), and an electrocardiogram (ECG). These tests help identify possible underlying conditions and determine the severity of the tachycardia.
What can pet owners do and professional therapy options
As a pet owner, you can take some measures to support your dog’s well-being while waiting for the vet appointment. Ensure your dog is in a calm and stress-free environment to avoid further increases in heart rate.
Exercise should be limited to a minimum to reduce stress on the heart. Do not let your dog overexert itself and avoid exciting situations that could further increase its heart rate.
Always keep fresh water available and ensure your dog drinks enough fluids. Good hydration can help support circulation and potentially alleviate symptoms.
If your dog is taking medication for an existing heart condition, ensure it is administered regularly and according to your veterinarian’s instructions. Avoid giving your dog new medications or supplements without consulting your veterinarian, as these could affect the heart rate.
Outlook on current research
Research on increased heart rate, also known as tachycardia, in dogs focuses on identifying causes and developing effective diagnosis and treatment strategies. Current studies are investigating the role of genetic factors, environmental conditions, and nutrition on heart rate in dogs. Researchers are trying to identify the genetic markers that make dogs more susceptible to tachycardia in order to develop targeted prevention strategies. In addition, research is being conducted on how environmental stressors, such as noise or social isolation, can affect heart rate. These findings could help minimize the risk of tachycardia through targeted changes in the dogs’ living environment.
Another area of research focuses on developing new technologies and methods for continuous heart rate monitoring in dogs. Wearable technologies, such as special collars or implantable sensors, are being developed to monitor heart rate in real time. These technologies could enable veterinarians to detect anomalies early and intervene promptly. Research in this area aims to improve the accuracy and reliability of these devices and make them more accessible for everyday use in pets.
In clinical research, new medications and therapies are being tested to effectively control heart rate. Studies are evaluating the efficacy of beta-blockers, calcium channel blockers, and other heart rate-lowering medications to establish the best treatment protocols. In parallel, the effect of dietary changes and nutritional supplements on the heart health of dogs is being investigated. Omega-3 fatty acids, antioxidants, and other nutrients are being examined for their ability to regulate heart rate and support the overall cardiovascular system.
The role of telemedicine in monitoring and treating heart problems in dogs is also being intensively researched. With the advancement of communication and diagnosis tools, veterinarians can increasingly offer remote consultations, which is particularly important in rural or underserved areas. Telemedicine provides a platform where veterinarians can analyze data from wearable heart rate monitors and provide real-time recommendations. This development could revolutionize the way heart problems in dogs are diagnosed and treated.
In summary, current research shows promising progress in the prevention, diagnosis, and treatment of tachycardia in dogs. The combination of genetic studies, technological innovations, and new therapeutic approaches could lead to improved heart health in dogs in the future. These developments aim to improve the quality of life for affected animals and provide pet owners with better tools to monitor and care for their pets’ heart health.