Do Cats Feel the Heat?
Cats are descended from Felis silvestris lybica, the African wildcat — a desert-adapted species that is genuinely more tolerant of heat than many other domestic animals. This is one reason cats often seek out sunny spots and warm surfaces that would send a dog panting for shade. Their thermoregulatory systems are calibrated for warmth in a way that dogs' are not.
However, "more tolerant" does not mean "immune." Cats absolutely can suffer from heat exhaustion and heatstroke, and in some circumstances — sealed indoor spaces, conservatories, cars, or environments without shade or water — the risk is very real. Certain categories of cat are at significantly elevated risk, and every owner should know the signs of overheating and what to do when they appear.
Normal Body Temperature and When to Worry
A healthy cat's normal body temperature ranges from 38°C to 39.2°C. Once core temperature rises above 40°C, heat stress begins; above 41°C, heatstroke is occurring, and organ damage becomes a risk if the temperature is not brought down quickly. Unlike dogs, cats rarely pant under normal circumstances. Heavy, open-mouthed panting in a cat is always a sign that something is wrong and should never be dismissed as normal warm-weather behaviour.
Which Cats Are at Highest Risk?
Flat-Faced Breeds
Brachycephalic cats — those with flattened faces and shortened nasal passages — are significantly more vulnerable to heat than cats with normal anatomy. Persian cats and Exotic Shorthairs are the most common examples. Their restricted airways mean they cannot move air efficiently enough to cool themselves through the panting and rapid respiration that other cats use in extremis. If you have a flat-faced cat, heat management in summer needs to be a priority, not an afterthought.
Overweight Cats
Excess body fat acts as insulation, making it harder for a cat to dissipate heat. Overweight cats also tend to be less active, which means they are less likely to seek out a cooler spot before they become dangerously hot. If your cat is overweight — something your vet can assess using a body condition score — summer is an additional reason to address this alongside the longer-term health implications of obesity.
Senior Cats
Older cats may have reduced cardiovascular function, underlying kidney disease (very common in cats over 10), or other conditions that compromise their ability to respond to heat stress. Senior cats should be monitored more closely during heatwaves and given easy access to cool resting spots without having to navigate stairs or jump to reach them.
Cats in Sealed Indoor Spaces
This is a risk that is particularly relevant in the European context. A flat in Barcelona, Madrid, Rome, or Athens without air conditioning can reach dangerous internal temperatures during a summer heatwave. A cat locked into a conservatory or a south-facing room with the window closed can overheat in a matter of hours. This is also why cats must never be left in parked cars, even briefly — internal car temperatures rise to lethal levels within minutes on a warm day.
Recognising Heatstroke in Cats
The signs of heatstroke in cats include:
- Heavy panting or open-mouthed breathing — this is the most urgent warning sign
- Excessive drooling or a wet chin
- Lethargy or unsteadiness on their feet
- Gums that are bright red, pale, or tacky rather than moist and pink
- Vomiting
- In severe cases: collapse, seizures, or loss of consciousness
If you observe any of these signs, this is a veterinary emergency. Act immediately.
First Aid for Heatstroke
Move the cat to a cool, shaded environment immediately. Apply cool — not cold or iced — water to the paws, groin, and back of the neck. A damp cloth works well. Do not submerge the cat in cold water or pour cold water over it — rapid cooling can cause shock and constrict blood vessels in a way that actually traps heat in the core. Fan the cat gently to help the evaporation of the water carry heat away.
Then get to a vet immediately, even if the cat appears to recover. Heatstroke causes internal damage — particularly to the kidneys — that may not be immediately visible but that requires veterinary assessment and management. Do not wait to see if the cat is "fine" before calling the vet.
Prevention: Practical Steps for a Cool Cat
Water, Water, Water
Cats are notoriously low water drinkers, which can become dangerous in summer when hydration needs increase. Provide multiple water bowls in different locations around the home. Many cats prefer running water — a pet water fountain can significantly increase drinking. Some cats enjoy ice cubes in their water bowl; others are suspicious of change, so introduce these gradually. Wet food has a high moisture content and contributes meaningfully to daily fluid intake — switching to wet food or adding water to meals during summer is a practical measure.
Ceramic and Stone Floors
Tiles, stone, and ceramic floors stay significantly cooler than carpeted or wooden surfaces in warm weather. Cats seek these surfaces out instinctively. Ensure your cat has access to at least some tiled floor space during hot days — do not confine a cat to a carpeted room in summer.
Cooling Mats
Self-cooling gel mats designed for pets are widely available and work passively without electricity. Most cats investigate them with curiosity and many use them readily. Place them in spots the cat already favours resting.
Frozen Treats
Small frozen treats can help cats cool down and increase fluid intake. Ice cubes made from diluted tuna water or plain water are simple to prepare. Ensure treats are appropriate for cats and given in moderation — the goal is cooling and hydration, not supplementing the main diet.
Air Movement
Cats enjoy a breeze, and fans can help make an indoor space more comfortable during hot weather. Position fans to move air across the room rather than blowing directly onto the cat, which some find uncomfortable. If you have air conditioning, ensure the cat can always access the cooled space; equally, ensure it can also retreat to a warmer area if it chooses — cats should always have temperature options.
White and Light-Coloured Cats: An Additional Summer Risk
White cats, and cats with white ears and noses, face a specific summer risk that is entirely separate from heatstroke: solar-induced squamous cell carcinoma. This is a form of skin cancer that develops in unpigmented skin exposed to UV radiation over time. The ear tips and the bridge of the nose are the most commonly affected areas — precisely the places that receive the most sun when a cat is lying in a sunny spot.
The early signs are reddening, crusting, and thickening of the skin at the ear tips or on the nose, which may progress to ulceration. This is a serious condition that requires veterinary treatment, including in some cases surgical removal of affected tissue.
Prevention involves either limiting outdoor sun exposure during the peak UV hours of 10am to 4pm, or applying a pet-safe sunscreen to vulnerable areas. Standard human sunscreen is not safe for cats — it contains ingredients such as salicylates and zinc oxide that are toxic if ingested during grooming. Use only formulations specifically designed and labelled for use on cats, applied sparingly to the ear tips and nose.
The European Summer Context
For cat owners in Spain, Portugal, southern France, and Italy, summer presents more extreme heat than most UK cat owners are accustomed to managing. An un-air-conditioned flat in summer in these countries can sustain indoor temperatures of 30°C or above for weeks at a time. Flat-dwelling cats in these environments need active heat management: multiple water sources, cool floor access, blocked conservatories and glass-fronted spaces, and ideally some air movement at night. If you are relocating to a Mediterranean country with a cat, factor climate management into your housing and routine planning well in advance of the summer months.