(Hypertension in Dogs and Cats) Do Dogs and Cats Get High Blood Pressure? A Veterinarian’s Guide to the “Silent Killer”

By Dr. Ryan Chuang

We all know that humans need to check their blood pressure regularly, but did you know that hypertension (high blood pressure) is also a significant health risk for our pets?

Because animals cannot speak, owners often don’t realize their dog or cat is feeling unwell until serious damage has occurred. Hypertension is far more common than most people think, particularly in senior pets or those with underlying medical conditions. Without regular monitoring by a veterinarian, it is often missed—leaving pets without appropriate treatment.

Here is what every pet owner needs to know about hypertension in dogs and cats.

1. What Causes Hypertension in Dogs and Cats?

In veterinary medicine, high blood pressure is generally categorized into three types:

A. Situational (Stress) Hypertension

Just like some people get nervous at the doctor, pets experience "white coat syndrome." If a dog or cat is stressed or fearful during the examination, their blood pressure will spike. This is a temporary emotional response and does not require medication.

B. Secondary Hypertension (The Most Common Cause)

This is the most common form of high blood pressure in pets. It is caused by an underlying disease or the use of certain medications:

• Medication-induced: Examples include corticosteroids or erythropoietin-stimulating agents.

• Common in Dogs: Often associated with chronic or acute kidney disease, Hyperadrenocorticism (Cushing's disease), obesity, or certain adrenal gland tumors.

• Common in Cats: Frequently linked to chronic kidney disease, Hyperthyroidism, or primary hyperaldosteronism.

C. Idiopathic (Unknown) Hypertension

Recent statistics suggest that cases with no identifiable cause are more common than previously thought. In cats with hypertension, roughly 13-20% are diagnosed as idiopathic.

2. How Does High Blood Pressure Damage a Pet’s Body?

Chronic hypertension forces the heart to work harder and damages blood vessels. It primary affects "end organs" that have high blood flow:

• Brain: Can lead to seizures or strokes.

• Heart: Causes the heart muscle to thicken (hypertrophy) or leads to congestive heart failure.

• Kidneys: Accelerates damage to kidney function, leading to renal failure.

• Eyes: Can cause retinal hemorrhage, retinal detachment, and sudden, irreversible blindness.

3. Symptoms to Watch For: The Warning Signs

• Behavioral Changes: Lethargy, weakness, lack of concentration, pacing, or newly developed aggression.

• Sudden Vision Issues: Dilated pupils that don't react to light, or sudden blindness.

• Changes in Habits: Increased drinking and urination, or reduced appetite.

• Chronic Signs (The aging myth): Gradual increases in blood pressure are common in older pets. Many owners mistake the resulting lethargy or behavioral changes for "just getting old," when the pet is actually suffering from untreated hypertension.

4. When Should My Pet Have Their Blood Pressure Checked?

Since there is not yet established universal consensus on routine screening for young, healthy animals, veterinarians recommend targeted screening:

• Senior Pets (Aged 9+): Regular blood pressure monitoring is highly recommended as a preventative health measure.

• At-Risk Pets: Any dog or cat diagnosed with kidney disease, heart issues, or endrocrine disorders must have regular blood pressure checks.

5. Why You Cannot Check a Pet’s Blood Pressure at Home

We do not recommend using home blood pressure monitors. The standard "oscillometric" devices sold for humans are usually inaccurate when used on animals, as pets rarely hold still enough for a correct reading, leading to dangerous misinterpretations.

Accurate measurement requires professional equipment—often a Doppler blood pressure monitor—operated by a skilled veterinarian or technician. Diagnosis is not based on a single number but on a professional assessment of the pet's clinical state and stress levels.

6. Treatment and Management: Is There a Cure?

Whether hypertension can be "cured" depends on the cause:

• Treatable Causes: If the hypertension is caused by medication or an underlying disease (like hyperthyroidism in cats), treating the primary cause may return blood pressure to normal.

• Long-Term Management: Most hypertensive pets require lifelong daily medication to control their blood pressure.

Important Note: Never stop hypertension medication without explicit veterinary instructions. Even if your pet appears healthy, stopping the medication can lead to a dangerous, sudden spike in blood pressure. Regular follow-up exams are essential to adjust dosages and monitor for complications.

Ask Your Veterinarian

Hypertension is a serious but manageable condition. Detecting it early can save your pet's vision and organ function. If you have concerns about your pet’s blood pressure, please schedule a check-up today.

(Article by Dr. Ryan Chuang. Reproduction without permission is prohibited, but sharing the original link is welcomed.)