Summer Dog Safety: Preventing Heatstroke and Signs of Overheating
Every summer, dogs die from heatstroke on days their owners thought were "not that hot." It doesn't take a record-breaking heat wave. A regular sunny afternoon at 82F (28C) is enough to put a dog in serious danger, especially if there's humidity, direct sun, or hot pavement involved.
Most people underestimate how quickly heat becomes a problem for dogs. If you're outside and you feel warm, your dog is already much hotter than you are.
How Dogs Cool Down (And Why It Doesn't Work Well)
Humans sweat. Dogs don't. Not in any meaningful way, at least.
Dogs cool themselves almost entirely through panting. They draw air over the moist surfaces of their tongue and airways, which helps evaporate moisture and release heat. They also release a small amount of heat through the pads of their paws.
The problem is that panting stops working when the air is hot and humid. If the air your dog is breathing in is already warm and full of moisture, there's nowhere for the heat to go. Their body temperature starts climbing, and it can rise dangerously fast.
This is why a 78F day with 90% humidity can be just as dangerous as a 95F day with low humidity. It's not just the temperature. It's how well your dog can cool down in those conditions.
When It's Too Hot for Walks
There's no single magic number, but here's a solid guideline: if it's above 80F (27C) and humid, be very careful with outdoor activity. Above 85F (29C) in direct sun, most dogs shouldn't be doing anything more than a quick bathroom break. These are general guidelines, not hard rules. Many factors affect heat risk, including humidity, sun exposure, and your dog's individual tolerance.
The 7-Second Pavement Test
Here's something a lot of people miss. When the air temperature is 85F, asphalt can reach 135F or higher. That's hot enough to cook an egg, and it's definitely hot enough to burn your dog's paw pads.
Before any walk, press the back of your hand flat against the pavement and hold it there for 7 seconds. If it's too hot for your hand, it's too hot for your dog's paws. This simple test could prevent painful burns that take weeks to heal.
If the pavement fails the test, stick to grass, dirt paths, or wait until later in the evening when the ground has cooled down.
Best Times to Walk
Early morning (before 8 AM) and late evening (after 7 PM) are generally the safest windows during summer. The sun is lower, the pavement has had time to cool, and the air temperature is usually more manageable.
If you have to go out midday, keep it extremely short, stay on grass, bring water, and watch your dog closely.
Brachycephalic Breeds Are at Higher Risk
If you have a Pug, Bulldog, French Bulldog, Boston Terrier, Boxer, Shih Tzu, or any other flat-faced breed, you need to be extra cautious. These dogs are called brachycephalic breeds, and their shortened airways make them much less efficient at cooling down through panting.
According to the American Kennel Club, brachycephalic breeds are significantly more likely to suffer from heatstroke compared to dogs with longer snouts. They overheat faster and have a harder time recovering.
Other dogs at higher risk include:
- Senior dogs and puppies (less able to regulate body temperature)
- Overweight dogs (extra insulation traps heat)
- Dogs with thick or dark coats (absorb more heat)
- Dogs with heart or lung conditions (already compromised cooling ability)
If your dog falls into any of these categories, dial back the summer activity even more than you normally would.
Signs of Overheating
Heat exhaustion can progress to full-blown heatstroke in minutes. Knowing the early warning signs gives you the best chance of catching it before it becomes an emergency.
Early Signs (Act Now)
- Heavy, rapid panting that doesn't slow down when your dog rests
- Excessive drooling, sometimes thick or ropey
- Red gums and tongue (brighter than normal)
- Seeking shade or refusing to keep walking
- Restlessness or anxiety
Progressing Signs (Emergency)
- Stumbling, wobbling, or lack of coordination
- Confusion or glazed eyes
- Vomiting or diarrhea (sometimes with blood)
- Dark red or purple gums (a sign of oxygen deprivation)
- Rapid heartbeat
Severe Signs (Life-Threatening)
- Collapse
- Seizures
- Loss of consciousness
- No response to commands or stimulation
If you see any of the progressing or severe signs, your dog is in immediate danger. Stop everything and start cooling them down.
What to Do If Your Dog Overheats
Getting to a vet is the priority, but while you're on the way or waiting for help, these steps (recommended by veterinary organizations) can help start the cooling process:
1. Get them out of the heat. Move your dog into air conditioning, shade, or the coolest area available. Get them off hot pavement immediately.
2. Offer cool water to drink. Let them drink at their own pace. Don't force water into their mouth, as that can cause aspiration.
3. Start cooling them down with cool water, not ice water. This is a common mistake. Ice water and ice packs constrict blood vessels near the skin, which actually traps heat inside the body. Use cool (not cold) water instead.
4. Apply wet towels to key areas. Focus on the neck, armpits, groin, and paw pads. These are the areas where blood vessels are closest to the surface, so cooling them here has the biggest effect. Re-wet the towels frequently since they warm up fast.
5. Use a fan if available. Moving air over wet fur helps with evaporative cooling, similar to how sweating works for humans.
6. Get to a vet. Even if your dog seems to be recovering, get them to a veterinarian. Heatstroke causes internal organ damage (kidneys, liver, brain) that can continue even after your dog's temperature comes back down. A dog that looks fine after cooling down can still crash hours later.
Never Leave a Dog in a Car
This one gets repeated every summer, and every summer dogs still die in parked cars. Even with the windows cracked. Even in the shade. Even if you're "only going to be a minute."
On an 80F day, the inside of a car can reach 100F in just 10 minutes. After 30 minutes, it can hit 120F. At that temperature, heatstroke and death happen fast.
If you can't take your dog inside with you, leave them at home. There's no errand worth the risk.
Safe Summer Snacking
Summer usually means barbecues, picnics, and more opportunities for your dog to beg for (or steal) human food. Some of it is fine to share. Some of it isn't.
Watermelon flesh, plain cooked chicken, blueberries, and carrots are all safe options. But grapes, onions, corn on the cob, and anything with xylitol can be dangerous or deadly.
If you're at a cookout and someone asks "can the dog have this?", you can look it up in the Lumis Paw app. It covers 321+ foods for dogs and cats, so you'll know in a few seconds whether something is safe to share. It's free and a lot faster than Googling it while your dog is giving you the eyes.
Swimming Safety
A lot of dogs love water, and swimming is a great way to cool down and burn energy without the risks of hot pavement. But there are a few things to keep in mind.
Not all dogs can swim. Brachycephalic breeds (Bulldogs, Pugs) are often poor swimmers because of their body structure. Never assume your dog can handle deep water. Start shallow and supervised.
Watch for water intoxication. Dogs that repeatedly bite at water while swimming or fetching can swallow too much, leading to a condition called water intoxication (hyponatremia). It's rare but can be fatal. If your dog is spending a lot of time snapping at water, take breaks.
Rinse them off after. Chlorine from pools and bacteria from lakes or ponds can irritate skin. A quick rinse with fresh water after swimming goes a long way.
Always supervise. Even strong swimmers can get exhausted, tangled in something, or panicked. Stay close.
Cooling Tips That Actually Work
You don't need fancy equipment to keep your dog comfortable in the heat. Here are some practical options:
- Kiddie pool. Fill a shallow plastic pool with a few inches of water. Most dogs will wade right in, and even just standing in cool water helps bring their temperature down.
- Frozen treats. Freeze plain broth (no onion, no garlic) in an ice cube tray, or stuff a Kong with peanut butter and freeze it overnight. These keep dogs occupied and cool.
- Cooling mats. Gel-based cooling mats don't need electricity or refrigeration. They activate with pressure and give your dog a cool surface to lie on. Great for indoor and outdoor use.
- Shade and airflow. This sounds obvious, but make sure your dog has access to shade at all times when outside. A fan or a breezy spot makes a big difference.
- Fresh water, always. Bring a portable bowl and water bottle on every walk. At home, check water bowls throughout the day since water left in the sun gets hot fast.
When to See the Vet
Some situations call for an immediate vet visit, no question:
- Your dog collapsed or had a seizure after being in the heat
- Heavy panting that doesn't improve after 10 to 15 minutes of cooling
- Vomiting or diarrhea after heat exposure
- Dark red, purple, or pale gums
- Your dog seems confused, wobbly, or unresponsive
- Your dog stops panting suddenly (this can mean their body's cooling system has failed)
Even if your dog seems to bounce back after overheating, a vet visit is still a good idea. Heatstroke can cause delayed kidney damage, liver damage, and brain swelling that aren't visible from the outside. According to PetMD, organ damage from heatstroke can show up 3 to 5 days after the initial episode.
If you're not sure whether the situation is serious enough for the vet, err on the side of going. With heatstroke, it's always better to overreact than underreact.
Quick Checklist: Summer Dog Safety
- Check the pavement: 7-second hand test before every walk
- Walk off-peak: Early mornings (before 8 AM) or late evenings (after 7 PM)
- Bring water: Portable bowl and a bottle, every time
- Watch the panting: If it doesn't slow down during rest, stop and cool down
- Know your breed: Flat-faced dogs overheat much faster
- Never leave them in the car: Not even for a minute
- Provide shade and water at home: Check that water bowls aren't in direct sun
- Skip midday exercise: On hot days, save the fetch session for the evening
- Watch for symptoms: Heavy panting, red gums, stumbling, drooling
- When in doubt, vet: Heatstroke causes hidden damage, so don't wait
The Bottom Line
Summer is great for dogs. More walks, more outdoor time, more adventures. But warm days are more dangerous than most people realize, and heatstroke can go from "a little too warm" to life-threatening in minutes.
Stick to cool hours for exercise, always have water available, learn the warning signs, and don't hesitate to call your vet if something seems off. A little caution goes a long way.
Not sure if a summer snack is safe for your dog? Check it in Lumis Paw. It's free, covers 321+ foods, and takes a few seconds.
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Disclaimer: This article is for informational purposes only and is not a substitute for professional veterinary advice. If your pet has eaten something potentially harmful, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately.