Summer Safety for Dogs and Cats: Heatstroke and Other Hazards

By Dr Duncan Houston

Summer safety starts before your pet looks uncomfortable. Exercise, hot rooms and parked vehicles can overwhelm a dog's or cat's ability to lose heat, while hot surfaces, unsafe water and outdoor chemicals create other risks.

This guide focuses on dogs and cats. Plan around your pet's health and the conditions where you live, and know where to find emergency veterinary care before an outing or holiday.

Quick Answer

Provide a reliably cool resting place, drinking water and exercise suited to the weather, and never leave pets in parked cars. If a dog or cat appears overheated and unwell, start cooling with cold tap water immediately and arrange emergency veterinary care. Supervise swimming, avoid hot surfaces and use only parasite and skin products suitable for your pet's species.

Which pets need extra protection from heat?

Flat-faced pets, those carrying excess weight, very young or older animals, and pets with breathing or heart disease need particular care. Dogs can overheat during enthusiastic exercise even when they are willing to continue; avoid treating their enthusiasm as a safety check. See PDSA's veterinary guidance on heatstroke in dogs.

Cats need access to cooler places and can become trapped in sheds, greenhouses or sun-filled rooms. Panting in a cat deserves prompt attention, especially after heat exposure. Open-mouth or difficult breathing requires emergency assessment, including when the weather is cool, because heart or airway disease can also cause it. PDSA's cat heatstroke guidance explains their particular risks.

Summer warning signs and when to act

What you notice	What it may mean	Action and timing
Unusually heavy panting, drooling or weakness after heat or exercise	Possible heat illness	Stop activity, start cooling and call a vet immediately.
Collapse, confusion, seizures, breathing difficulty or bloody vomiting or diarrhea	A potentially life-threatening emergency	Seek emergency care now. Begin cooling if overheating is suspected.
Limping, paw licking or damaged pads after walking on hot ground	Possible burns or another paw injury	Move off the surface and contact a vet promptly; severe pain needs urgent care.
Vomiting, wobbliness or breathing changes after swimming or possible toxin exposure	Possible poisoning or water-related injury	Contact an emergency vet immediately and describe the exposure.

Emergency first aid for suspected heatstroke

Begin cooling straight away. Do not wait to find a thermometer or finish a walk.

Stop further heating. Move into shade or a cooler room and stop exercise.
Apply cold tap water to the body. Wet the coat through to the skin, keeping water away from the nose and mouth. Handle cats gently. Avoid forcing a frightened, weak or unconscious animal into water.
Add airflow and call the nearest available vet. Use a fan or air conditioning. Have another person call while you cool, if possible. Offer drinking water only if the pet is alert and able to swallow; never force it.
Arrange prompt transport after starting cooling. Travel in a cooled vehicle, continuing safe cooling with a helper if available. Secure cats in a ventilated carrier. Do not postpone departure waiting for complete recovery.

Do not wrap the pet in wet towels or delay while preparing ice water. Cold tap water is suitable. This approach follows RSPCA heatstroke first aid and PDSA's dog and cat guidance.

A pet that seems brighter after cooling still needs veterinary assessment. Heatstroke can affect organs and blood clotting, and examination, fluid support, tests or monitoring may be needed.

Build a safer summer routine

Check the whole outing. Consider humidity, shade, ground surfaces, travel and your pet's stamina. Early or late walks help only if conditions are actually cooler. Replace strenuous exercise with quiet indoor activities during hot weather.
Provide reliable cooling at home. Keep resting areas out of direct sun, maintain ventilation and use air conditioning when needed. Check that pets cannot become trapped in hot rooms. Secure window screens.
Make water easy to reach. Keep bowls clean and replenished, including in separate resting areas. Bring drinking water on trips. A pet unable to drink or keep water down needs veterinary advice.
Plan travel and backup care. Cool the vehicle before loading, keep carriers ventilated and arrange a safe place for the pet during stops. Keep identification details current and take regular food, prescribed medicines and local veterinary contact details.
Support everyday wellbeing. Maintain a healthy weight and predictable meals and rest. Use gentle reward-based training, scent games or food puzzles when outdoor exercise is limited. Introduce new experiences gradually and provide a quiet retreat during gatherings or fireworks.

Shade can move and enclosed spaces can heat up. Never leave pets alone in parked vehicles, even with windows partly open. The RSPCA's summer welfare advice covers shade, water and environmental protection.

Protect paws and exposed skin

Avoid sun-heated pavement, sand and artificial turf. Choose cool, shaded ground and check paws if your pet starts lifting them or refusing to walk. A brief hand test cannot guarantee that a surface is safe throughout an outing.

Limit strong sun on exposed or sparsely covered skin. Ask your vet which sunscreen is suitable for your dog's or cat's species and where to apply it. Do not assume a human sunscreen or insect repellent is safe for a pet that may lick it off.

Make water activities safer

Supervise pets around water, provide an easy exit and introduce swimming gradually without forcing it. Use an appropriate flotation device on boats. Bring fresh water and discourage drinking seawater or pool water. These precautions are included in the ASPCA's hot-weather safety advice.

Check local warnings before visiting lakes or rivers. Keep pets away from scum, discolored water or suspected algal blooms. If a pet enters suspect water, prevent licking and rinse the coat with clean water, then contact a vet promptly about the exposure. Illness can develop rapidly. The CDC's guidance on harmful algae and pets explains this risk.

Prevent parasites and toxic exposures

Review flea, tick and heartworm prevention with your vet before travel, accounting for destination, lifestyle and existing treatment. Protection may be needed beyond summer; Companion Animal Parasite Council guidelines recommend year-round control tailored to local risks.

Choose products for the correct species, age and weight. Never put a dog-only flea treatment on a cat, and follow label instructions about separating pets after topical application. See the FDA's advice on safe flea and tick product use.

Secure barbecue leftovers, alcohol, rubbish, garden chemicals and pool chemicals. Follow garden-product labels before allowing pets back into treated areas. For suspected poisoning, call a vet or animal poison service immediately with the packaging or plant identification; do not induce vomiting unless instructed.

Common summer safety mistakes

Assuming a cat will always find somewhere cool, or a dog will stop before overheating.
Relying on a cooling accessory to make a hot car or strenuous outing safe.
Waiting for collapse before responding to heat distress.
Using swimming as unsupervised exercise or sharing parasite products between species.

Frequently Asked Questions

What temperature is too hot to walk my dog?

There is no single safe cutoff for every dog and outing. Humidity, exertion, health and surfaces matter. Shorten, reschedule or skip the walk when safe cooling cannot be maintained.

Can I use cold water on an overheated pet?

Yes. Cold tap water is suitable for immediate cooling of an overheated dog or cat. Keep it away from the airway and arrange emergency veterinary care.

Can indoor cats get heatstroke?

Yes, particularly if trapped somewhere hot with poor ventilation. Check access to cooler rooms and never assume a sun-filled indoor space stays comfortable.

Does my pet need a vet if cooling seems to work?

Yes, if heatstroke is suspected. Improvement at home does not rule out complications requiring treatment or follow-up.

A flexible routine lets pets enjoy summer while keeping their comfort and health first. Prepare for the conditions, watch for changes and act promptly when something is wrong.

ASK A VET™ supports informed everyday care. Visit ASK A VET™ for pet health information, and contact an emergency veterinary clinic directly when your pet needs urgent treatment.