Pet Heat Stroke: Know the Signs, Act Fast, and Stay Safe This Summer

6/23/2026

Summer in New England is one of the best times to enjoy the outdoors with our pets. Whether you're heading out for a walk, spending the day at the lake, or simply relaxing in the backyard, warmer weather often means more adventures together.

Unfortunately, summer also brings an increased risk of heat-related illness. Heat stroke is a life-threatening emergency that can develop quickly in both dogs and cats, especially during periods of high heat and humidity. Early recognition and prompt treatment can make a tremendous difference in your pet's outcome.

What Is Heat Stroke?

Heat stroke occurs when a pet's body temperature rises faster than they can cool themselves down. Unlike people, pets have limited ability to regulate their body temperature. Dogs rely primarily on panting, while cats have very few sweat glands and are even less efficient at cooling themselves. When panting isn't enough, blood will increasingly circulate to the skin at the cost of blood flow to internal organs, potentially causing long term damage.

When you pet's natural cooling mechanisms become overwhelmed, body temperature can rise to dangerous levels and begin damaging vital organs.

Heat stroke can occur in surprisingly common situations, including:

Exercising on hot or humid days
Being left outdoors without adequate shade or water
Riding in a poorly ventilated vehicle
Spending time in hot indoor environments without air conditioning
Participating in strenuous activities before being acclimated to warmer weather

Pets at Higher Risk

Any pet can develop heat stroke, but some are especially vulnerable:

Brachycephalic (flat-faced) breeds such as Bulldogs, Pugs, Boston Terriers, Persian Cats, and Himalayans
Senior pets
Puppies and kittens
Overweight pets
Pets with heart or respiratory disease
Pets with thick coats
Pets that are not accustomed to exercising in warm weather

Early Warning Signs of Heat Stress

Recognizing heat-related illness before it progresses to heat stroke can save your pet's life. Watch for:

Excessive panting
Heavy drooling
Bright red gums or tongue
Restlessness or anxiety
Weakness
Lethargy
Increased heart rate
Vomiting or diarrhea
Difficulty walking or loss of coordination

As heat stroke becomes more severe, pets may collapse, experience seizures, become unresponsive, or lose consciousness. These signs indicate a medical emergency requiring immediate veterinary care.

What Should You Do If You Suspect Heat Stroke?

If you think your pet may be overheating:

Move them immediately to a cool, shaded, or air-conditioned area.
Offer cool (not ice-cold) water if they are alert and able to drink.
Begin cooling with cool water on the paws, belly, and body.
Use a fan if available to increase air circulation.
Contact your veterinarian or the nearest emergency hospital right away.

Avoid using ice baths or extremely cold water. Rapid cooling can actually make it more difficult for the body to dissipate heat effectively. Also avoid using wet towels, since the towels warm quickly and then prevent the transfer of heat away from the body.

Most importantly, even if your pet appears to improve, they should still be evaluated by a veterinarian. Heat stroke can cause internal damage that may not be immediately visible.

Prevention Is Always Better Than Treatment

Fortunately, most cases of heat stroke are preventable.
Here are a few simple ways to keep your pet safe:

Exercise during cooler morning or evening hours
Bring plenty of fresh water on walks and outings
Provide access to shade whenever outdoors
Avoid strenuous activity on hot, humid days
Never leave a pet in a parked car—even for a few minutes
Keep indoor spaces cool and well ventilated
Be especially cautious with high-risk pets

As temperatures climb this summer, a little extra awareness can go a long way. If you ever have concerns that your pet may be overheating, don't wait! Contact us immediately. Heat stroke is a true emergency, and prompt treatment saves lives.