Heatstroke in Dogs and Cats: Warning Signs Every Pet Owner Should Recognize

Most pet owners know not to leave a dog or cat in a parked car. What surprises people is how quickly heatstroke can also happen on a regular walk, in a sunny backyard, or during a beach trip — or even indoors without air conditioning — on what feels like a perfectly pleasant afternoon.

Heatstroke in dogs and cats can become fatal in under an hour, and BC’s summers are getting hotter. With the first warm stretch of the year usually arriving in late May or early June, now is the right time to know exactly what to watch for — and what to do in the first crucial minutes.

If your dog or cat is showing serious signs of heatstroke, start cooling them down and call us immediately. Cooling before transport has been shown to dramatically improve survival.

What Heatstroke Actually Is

A dog’s normal body temperature sits between 101°F and 102.5°F (38.3–39.2°C); cats run in a very similar range, around 100.5°F to 102.5°F (38–39.2°C). Anything above 103°F is considered abnormal in either species. Once the body climbs above 104°F (40°C), heatstroke begins, and at 106°F (41°C) and above, the risk of organ damage and death rises sharply.

Unlike humans, dogs and cats don’t sweat — except a little through their paw pads. Dogs cool mainly through panting, which becomes far less effective in hot, humid conditions. Cats rely even more on grooming, spreading saliva over their fur to cool through evaporation, and typically don’t pant at all — so if you see a cat panting, treat it as a serious warning sign, not a normal cooling behavior. That’s why both dogs and cats can overheat much faster than owners realize, especially when exercising or in poorly ventilated spaces.

Early Warning Signs (Act Now)

These are the signs that your dog or cat is overheating but hasn’t yet tipped into a medical emergency. Catching them at this stage usually means a full recovery.

• Heavy, rapid panting that doesn’t ease when they stop moving (in cats, any panting at all is notable)
• Excessive drooling, often thicker and stickier than normal
• Bright red gums and tongue
• Skin that feels hot to the touch, especially the belly and ears
• Restlessness or agitation — pacing, refusing to lie down, seeking shade or a cool floor
• Slowing down or lagging behind on a walk, or unusual lethargy in cats
• Wobbliness, weakness, or stumbling

If you notice any of these, stop the activity, get your pet into shade or air conditioning, and offer small amounts of cool (not ice-cold) water.

Severe Warning Signs (This Is an Emergency)

These signs mean your dog or cat needs veterinary care immediately:

• Pale, white, blue, or grey gums
• Vomiting or diarrhea, sometimes with blood
• Disorientation, stumbling, or appearing confused
• Seizures or muscle tremors
• Collapse or loss of consciousness
• Extreme lethargy or unresponsiveness

At this stage, every minute matters. Heatstroke can lead to organ failure, internal bleeding, and shock — and survival rates climb dramatically when owners begin cooling their pet before getting to the vet.

Cool First, Transport Second

If you suspect heatstroke, your first priority is bringing your pet’s body temperature down. Then call us and head over.

1. Move them out of the heat — into shade, air conditioning, or in front of a fan.
2. Wet them with cool water — not ice-cold. Pour or spray over the belly, armpits, groin, and paw pads. Avoid covering them with wet towels (wet towels actually trap heat).
3. Use airflow — a fan, AC, or rolled-down windows in the car all help evaporative cooling.
4. Offer small sips of cool water if they’re alert. Don’t force it, and never pour water into the mouth of an unconscious dog or cat.
5. Do NOT use ice baths or ice packs. They can cause shock and constrict blood vessels in the skin, which actually slows internal cooling.
6. Call Petsville at 604-245-7474 (or your nearest emergency vet if we’re closed) and head over with the AC running. Cats often hide their distress, so if in doubt, come in.

Even if your pet seems to recover on the way, please still bring them in. Heatstroke can cause delayed organ damage that doesn’t show up for hours — and we’ll want to check kidney values, clotting, and overall recovery.

Dogs and Cats at Higher Risk

Some pets overheat faster than others. Be especially careful with:

• Brachycephalic (flat-faced) breeds — in dogs: pugs, French bulldogs, English bulldogs, boxers, Boston terriers, shih tzus; in cats: Persians, Himalayans, and exotic shorthairs. Their shortened airways make panting and heat dissipation much less effective.
• Senior pets and young puppies or kittens, who regulate temperature less efficiently
• Overweight dogs and cats
• Pets with thick, double, or long coats — huskies, malamutes, and golden retrievers among dogs; Maine Coons, Persians, and other longhaired cats
• Pets with heart, lung, or laryngeal conditions
• Pets not yet acclimated to warm weather (early-season heat is often the worst)

Prevention: How to Keep Your Dog or Cat Safe This Summer

• Walk dogs early or late — before 9 a.m. or after 7 p.m. on warm days
• Test the pavement before a dog walk. Press the back of your hand to the sidewalk for 7 seconds. If it’s too hot for you, it’s too hot for paws — and reflected heat from pavement raises body temperature fast
• Always have fresh water available, indoors and out, for both dogs and cats
• Provide deep shade if your dog spends time in the yard, and make sure indoor cats have access to the coolest part of the home (or a fan) on hot days
• Keep longhaired cats and dogs well-groomed in summer — matted fur traps heat and blocks airflow to the skin
• Never, ever leave a dog or cat in a parked car — even for “just a minute,” even with windows cracked. On a 25°C day, the inside of a car can hit 40°C in 10 minutes
• Watch for early signs on hikes and at the beach with dogs, or during any outdoor time with cats. Pets will keep going long past the point of safety to please you or chase something interesting
• Skip strenuous play on hot, humid days — fetch, long runs, dog park sprints, or vigorous play sessions with cats

When to Call Petsville

Call us at the first sign of heat distress in your dog or cat. We can talk you through cooling steps over the phone and prepare for your arrival. After a heatstroke episode, pets often need fluids, blood work, and monitoring for 24–48 hours to make sure their organs are recovering properly.

Suspect heatstroke in your dog or cat? Start cooling and call Petsville right away at 604-245-7474.