TORONTO, ON / AGILITYPR.NEWS / June 29, 2026 / As temperatures climb across the Greater Toronto Area this week, Toronto Humane Society is reminding pet guardians that extreme heat can quickly become dangerous—even deadly—for animals. 

Unlike people, pets have limited ways to cool themselves and can develop heatstroke in a matter of minutes. Dogs, cats, rabbits, guinea pigs and other companion animals are all vulnerable during periods of high heat and humidity. 

"Heat-related emergencies can escalate very quickly," said Dr. Linda Jacobson, Director, Shelter Medicine Advancement, Toronto Humane Society. "A few simple precautions, like limiting outdoor activity, providing constant access to fresh water and never leaving an animal in a parked vehicle, can save a life." 

"Pets are at risk of overheating if they exercise vigorously in hot weather, lack shade, are in poorly ventilated spaces, or don't have adequate access to water. The most dangerous situation is being left in a hot car, where temperatures can rise quickly, often with tragic outcomes. These tips aim to help pet parents keep their furry friends safe during heatwaves," explains Dr. Jacobson. 

Who is Most at Risk for Heatstroke? 

Brachycephalic breeds, such as English and French bulldogs and pugs, are particularly vulnerable to heatstroke due to their compromised airways. Flat-faced cat breeds like Persians also struggle with heat but are less likely to overexert themselves outdoors. 

Other high-risk dogs include golden retrievers, Labrador retrievers, and chow chows. Young male dogs are prone to exertion-induced heatstroke, while older dogs with respiratory issues can overheat due to high environmental temperatures. Additional risk factors include obesity, long hair coats, heart and lung conditions, and dehydration.

Know the Signs of Heatstroke 

Heatstroke is a medical emergency that requires immediate veterinary attention. 

Dogs and Cats 

• Heavy panting or excessive drooling 
• Bright red gums or tongue 
• Lethargy or confusion 
• Vomiting or diarrhea 
• Rapid heartbeat 
• Collapse or unresponsiveness 

Small Pets, Including Rabbits and Guinea Pigs 

• Drooling 
• Panting or open-mouth breathing 
• Lying stretched out or appearing listless 
• Weakness or difficulty moving 

What to Do if Your Pet is Overheating 

If you suspect your pet is suffering from heatstroke: 

• Move them to a cool, shaded or air-conditioned area immediately. 
• Offer small amounts of cool (not ice-cold) water. 
• Wet their ears, paws and body with cool or lukewarm water to gradually lower their temperature. 
• Contact a veterinarian immediately. Do not wait for symptoms to improve. 

Preventing Heatstroke 

• Provide regular moderate exercise and maintain healthy body weights. 
• Keep pets cool in hot weather, ideally indoors during heatwaves. 
• Limit exercise to early morning or evening hours. 
• Avoid walking on hot asphalt to prevent paw burns. 
• Ensure pets have plenty of water, ice cubes, and wet their coats if they seem hot. 
• Consider clipping dense, long coats to help pets stay cool. 
• Share pet-safe frozen treats 

Never Leave an Animal in a Parked Vehicle 

Even with the windows cracked, the temperature inside a parked vehicle can rise to dangerous levels within minutes. 

If you see an unattended animal in a vehicle: 

• Call 1-833-9ANIMAL (1-833-926-4625) or your local police service. 
• Note the time, vehicle description and licence plate. 
• Try to locate the guardian while remaining calm. 

For more information, visit Toronto Humane Society at torontohumanesociety.com.