Signs Your Pet Is Overheating (And What to Do)

by Grace Briggs

As temperatures rise, it's not just people who feel the effects of the heat - our pets can struggle too. Dogs, cats, rabbits, guinea pigs, and other small animals are all vulnerable to overheating, and unlike humans, they have fewer ways to cool themselves down. This means that what might feel like a pleasant summer's day to us could become dangerous for them in a matter of minutes.

Overheating can quickly develop into heatstroke, a serious and potentially life-threatening condition that requires immediate attention. The good news is that, by recognising the warning signs early and knowing how to respond, you can significantly reduce the risk of severe illness and help keep your pet safe throughout the warmer months.

In this guide, we'll explain why pets overheat, the warning signs to look out for, what to do if you suspect your pet is suffering from heatstroke, and practical ways to prevent it from happening in the first place.

Why Do Pets Overheat?

Pets regulate their body temperature differently from humans. While we cool ourselves by sweating over much of our bodies, most pets have limited sweat glands and rely on other methods to lose heat.

Dogs primarily cool themselves through panting and by releasing small amounts of heat through their paw pads. Cats also pant when they become excessively hot, although they more commonly groom themselves, allowing saliva to evaporate from their fur to aid cooling. Rabbits and guinea pigs cannot sweat effectively and rely heavily on cooler surroundings to regulate their body temperature.

When environmental temperatures become too high - or when exercise, humidity, stress or poor ventilation prevent a pet from cooling down efficiently - their internal body temperature can begin to rise rapidly. Once this happens, organs can become damaged, circulation may be affected, and heatstroke can develop surprisingly quickly.

Which Pets Are Most at Risk?

Although any pet can overheat, some are significantly more susceptible than others.

Dogs with short or flat faces, such as Bulldogs, Pugs, French Bulldogs and Shih Tzus, often struggle because their shortened airways make panting less effective. Older pets and very young animals are also less able to regulate their body temperature efficiently.

Other high-risk groups include:

  • Overweight or obese pets

  • Pets with heart or respiratory conditions

  • Thick-coated breeds

  • Long-haired cats

  • Rabbits and guinea pigs housed in direct sunlight

  • Pets left in poorly ventilated rooms or vehicles

  • Animals exercised during the hottest part of the day

Humidity also plays an important role. Even if temperatures don't seem extreme, high humidity reduces the effectiveness of panting and evaporation, making it much harder for pets to cool themselves.

Early Signs Your Pet Is Overheating

Recognising the first warning signs can make all the difference. The earlier you intervene, the more likely your pet is to recover without serious complications.

One of the earliest symptoms in dogs is excessive panting. While panting after exercise is perfectly normal, unusually rapid, loud or persistent panting - particularly when your pet is resting - should never be ignored.

You may also notice that your pet becomes unusually restless. They might pace around the house, seek out cool flooring, move into shaded areas or seem unable to settle comfortably.

Other early warning signs include:

  • Excessive drooling

  • Bright red or very pale gums

  • Warm ears and paws

  • Increased heart rate

  • Heavy breathing

  • Lethargy

  • Weakness

  • Drinking excessive amounts of water

  • Reluctance to move

Cats may display overheating differently. Instead of obvious panting, they may hide away, become unusually quiet, drool, groom excessively or breathe more rapidly than normal.

Rabbits often become stretched out with their ears flattened, breathe faster than usual and may appear unusually inactive.

Serious Signs of Heatstroke

If overheating progresses, your pet may begin showing signs that require immediate veterinary treatment.

As body temperature continues to rise, the nervous system and internal organs begin to suffer. At this stage, delaying treatment can become life-threatening.

Serious symptoms include:

  • Collapse

  • Vomiting

  • Diarrhoea (sometimes containing blood)

  • Confusion or disorientation

  • Difficulty walking

  • Staggering

  • Muscle tremors

  • Seizures

  • Loss of consciousness

  • Very dark red or blue gums

  • Extreme weakness

Heatstroke is always considered a veterinary emergency. Even if your pet appears to recover after cooling down, internal damage may already have occurred and professional assessment is essential.

What Should You Do If Your Pet Is Overheating?

If you believe your pet is overheating, act immediately but remain calm. Your goal is to gradually lower their body temperature while arranging veterinary advice.

First, move your pet into a cool, shaded, well-ventilated area. Indoors with fans or air conditioning is ideal, but even moving out of direct sunlight can make a significant difference.

Offer fresh, cool drinking water, but never force your pet to drink. Small amounts are usually best.

Begin cooling your pet using cool - not ice-cold - water. Wet towels can be placed over areas such as the neck, chest, belly and paws. Alternatively, gently pour cool water over their body or use a fan to increase evaporation.

Avoid using ice packs or freezing water directly on your pet. Extremely cold temperatures can cause blood vessels near the skin to constrict, trapping heat inside the body and slowing the cooling process.

Contact your veterinary practice immediately while continuing to cool your pet. Even if they appear to improve, they should still be examined to ensure no complications have developed.

What Not to Do

When pets are overheating, well-meaning owners can sometimes make the situation worse.

Avoid:

  • Leaving your pet alone to recover

  • Placing them into an ice bath

  • Wrapping them tightly in wet towels without airflow

  • Forcing large amounts of water

  • Assuming they are safe once they stop panting

  • Waiting to see if symptoms improve before contacting a vet

Heatstroke can continue causing internal damage even after outward signs begin to settle.

Preventing Overheating

Fortunately, many cases of overheating are entirely preventable with a little preparation and awareness.

During hot weather, try to exercise dogs early in the morning or later in the evening when temperatures are lower. Always carry fresh water on walks and allow frequent rest breaks in shaded areas.

Never leave a pet inside a parked car, even for a few minutes. Temperatures inside vehicles can rise rapidly, even when it's cloudy or the windows are partially open, creating life-threatening conditions.

At home, ensure pets always have access to:

  • Fresh drinking water

  • Shade throughout the day

  • Well-ventilated spaces

  • Cool flooring

  • Resting areas away from direct sunlight

Tarhong Safari Pet Bowl Tiger Medium £10.09 and Bella Bowls Medium Paparazzi Pink £7.59

You can also help by brushing long-haired pets regularly to remove excess loose fur, while avoiding shaving breeds whose coats naturally help regulate temperature unless advised by a groomer or veterinarian.

Ancol Ergo Cat Slicker Brush £7.09 and Rosewood Soft Protection Salon Grooming Slicker Brush For Pets £8.19

For rabbits and guinea pigs, keep hutches out of direct sunlight, ensure plenty of airflow and consider providing cool ceramic tiles or frozen water bottles wrapped in towels so they can choose cooler areas to rest beside.

Helpful Products That Can Keep Pets Cool

A few carefully chosen products can make hot weather much more comfortable for your pet.

Cooling mats provide a cool surface for resting without requiring refrigeration in many cases. Elevated pet beds improve airflow underneath the body, helping pets lose heat more efficiently.

Portable water bottles and travel bowls make it easy to keep pets hydrated while out walking or travelling. Cooling bandanas and lightweight cooling vests can also help some dogs stay comfortable during short outings.

Other useful summer essentials include:

  • Cooling mats

  • Cooling bandanas

  • Cooling vests

  • Elevated pet beds

  • Portable water bottles

  • Collapsible travel bowls

  • Shade tents for outdoor use

  • Cooling toys

  • Grooming brushes for removing excess undercoat

These products should always be viewed as aids rather than replacements for proper supervision and sensible heat management.

All For Paws Chill Out Ice Bandana Small £8.29 and Henry Wag Elevated Dog Bed £44.99

Common Myths About Pets and Heat

Several myths continue to circulate regarding pet safety during warm weather.

One common misconception is that opening a car window keeps pets safe. Unfortunately, it doesn't. Temperatures inside a parked vehicle can still become dangerously high in a very short time.

Another myth is that only dogs suffer from heatstroke. Cats, rabbits, guinea pigs, birds and many other pets can all overheat under the wrong conditions.

Some owners also believe that panting is always normal. While mild panting after exercise is expected in dogs, excessive or prolonged panting without exertion should never be dismissed during warm weather.

Finally, some people assume that cloudy weather eliminates the risk. In reality, warm temperatures combined with high humidity can be just as dangerous because humidity reduces the body's ability to cool through evaporation.

When Should You Contact a Vet?

If your pet shows any signs of heatstroke - including collapse, vomiting, confusion, seizures or difficulty breathing - you should seek emergency veterinary care immediately.

Even milder cases deserve professional advice if symptoms don't improve quickly after cooling measures begin. Internal complications can develop hours after the initial incident, making prompt examination extremely important.

It's always safer to contact your veterinary practice and be told your pet is recovering well than to delay treatment until symptoms become severe.

Final Thoughts

Hot weather should be an enjoyable time for both pets and their owners, but it also brings responsibilities. Understanding how pets regulate their body temperature, recognising the early warning signs of overheating and knowing how to respond can make a life-saving difference.

Simple preventative measures - providing plenty of fresh water, avoiding the hottest parts of the day, ensuring access to shade and never leaving pets in parked vehicles - go a long way towards keeping animals safe.

By staying alert and acting quickly if something doesn't seem right, you can help your pet stay healthy, comfortable and happy throughout the summer, no matter how high the temperatures climb.

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