I’ll admit, I’ve left my dog in the car a few times while running quick errands, especially during the winter months. It always seemed harmless, especially when the outside temperature was cool. I thought, "It’s cold outside; what harm could it do?"
But as I learned, leaving pets in cars during winter is actually just as dangerous as leaving them in a hot car during summer. I never realized how quickly the temperature inside a car can drop, even when the outside air feels chilly. It doesn’t take long for the inside of a car to become freezing, putting our pets at risk for cold-related illnesses like hypothermia or frostbite.
It’s shocking how something that seems so harmless can actually be life-threatening for our furry companions. In this blog, I’m going to share why leaving pets alone in cars during winter is a serious risk, why I will never do it again, and what steps we can take to keep our dogs safe, no matter the season.
Why Is Leaving Pets In Cars During Winter Not Safe?
It’s a common misconception that cars provide shelter from the cold, but they can become hazardous in the winter, just as they can be in the summer. When a pet is left alone in a car, the temperature inside the vehicle can drop dramatically even on days that don’t seem particularly cold. This is because cars can trap cold air, and the lack of insulation causes the vehicle to cool down much faster than the outside environment.
In fact, the Centers for Disease Control and Prevention (CDC) reports that pets; particularly small dogs, older dogs, and puppies are vulnerable to hypothermia in temperatures below 50°F. This is a stark reminder that even relatively mild winter days can pose significant risks to our furry companions.
As Dr. Karen Halligan, a renowned veterinarian, states: "The problem with leaving pets in cars during cold weather is that they don’t have the ability to regulate their body temperature in the same way we do. What feels comfortable to us can be dangerous to them."
The Risk Of Hypothermia
Hypothermia occurs when a dog’s body temperature drops below normal levels, typically below 99°F. It is a serious and often life-threatening condition that can develop quickly when a dog is exposed to cold temperatures for extended periods. While we associate hypothermia with extreme cold, it can still affect pets in moderate winter temperatures, especially in a confined space like a car.
When a dog is left alone in a cold vehicle, their body works overtime to maintain warmth. However, without the ability to move around or generate body heat efficiently, they can lose warmth faster than they can replace it. Once a dog’s body temperature drops to critical levels, they can go into shock, and if not treated immediately, hypothermia can lead to organ failure or even death.
To ensure pets are never left in unsafe conditions, tools like the Waggle Pet Monitor offer a great solution. This device allows pet owners to monitor their pets’ environment even when they are away for a short time. The Waggle Pet Monitor features:
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Temperature Monitoring: Tracks the temperature, ensuring pets stay in a safe environment.
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Instant Alerts: Sends notifications to the owner's phone if the temperature falls to dangerous levels, allowing for quick action.
Signs and Symptoms to Watch For
When a pet begins to experience hypothermia, they will exhibit several telltale signs of hypothermia. If you notice any of these symptoms in your dog, immediate action should be taken to warm them up and seek veterinary care.

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Shivering or Trembling: The body’s attempt to generate heat by shaking.
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Lethargy or Weakness: The dog may appear exhausted or have difficulty standing.
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Slow Heart Rate or Breathing: As the body cools, circulation slows, and the heart rate can drop.
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Pale or Bluish Gums: This indicates that the dog’s circulation is slowing down.
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Dilated Pupils: A sign of body stress and lack of oxygen.
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Cold to the Touch: Especially in the extremities like ears, paws, or tail.
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Stiffness or Inability to Move: As the body temperature drops, muscle function deteriorates, leading to immobility.
If you notice any of these symptoms, it is crucial to warm your dog gently using blankets or warm water bottles and get them to a vet as soon as possible.
Which Dogs Are At The Highest Risk?
While all dogs are susceptible to hypothermia, certain breeds and conditions make some dogs more vulnerable than others. These include:
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Small Breeds: Smaller dogs lose heat faster due to their body mass-to-surface area ratio. Breeds like Chihuahuas, Dachshunds, and Yorkshire Terriers are particularly at risk.
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Older Dogs: As dogs age, their ability to regulate body temperature decreases. Older dogs are more prone to hypothermia, even in relatively mild temperatures.
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Puppies: Like older dogs, puppies have a more difficult time maintaining body heat, making them vulnerable to cold.
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Short-Haired Breeds: Dogs with little to no fur, such as Greyhounds, Whippets, or Doberman Pinschers, are more exposed to the elements and lack the insulation that longer-haired breeds may have.
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Sick or Injured Dogs: Dogs that are already ill or injured may have a compromised immune system, making it harder for them to maintain their body temperature in cold conditions.
Even healthy dogs of other breeds can suffer in these conditions, so it's best not to leave your dog alone in a car during winter; no matter their breed or size.
Understanding Why There Is No "Safe" Season For Unattended Pets
Many pet owners mistakenly believe that leaving their pets in a car is only dangerous in the summer, but the truth is, there is no "safe" season when it comes to leaving pets unattended in vehicles. Whether it’s the heat of summer or the chill of winter, cars can become dangerously hot or cold very quickly.
In winter, although the outside temperature may seem tolerable, the interior of a parked car can cool down rapidly. Even when it's not freezing outside, a vehicle can trap the cold air, making the inside temperature plummet, which can be hazardous to your pet. Dogs and other pets have much smaller body mass than humans and can’t regulate their body temperature as effectively. This means that what might feel like a mild, cool day for you could be a potentially life-threatening situation for your pet.
Just like the extreme heat during summer, winter cold is not to be underestimated. Pets left alone in cars can easily suffer from hypothermia, frostbite, or other cold-related injuries, even if it’s a bright, sunny winter day. It's always best to bring your pet with you or leave them at home in a safe, warm environment when you’re running errands.
Risks Of Unrestrained Pets While Driving
In addition to the dangers of leaving your pet alone in a parked car, another risk that many pet owners overlook is the danger of unrestrained pets during car travel. Pets who are not properly secured in the vehicle can be a hazard to themselves and others. In the event of a sudden stop or accident, an unrestrained pet can be thrown from their seat, causing injury to themselves or the driver.

Even in winter, when the air feels crisp and cool, sudden stops or swerving due to slippery roads can cause your pet to be injured. Unrestrained pets can also be a distraction to the driver, taking their attention away from the road, which increases the likelihood of an accident. It is essential to secure your pet in a vehicle harness or a crate during travel to keep them safe, no matter the season.
Watch Out For Laws Regarding Pets In Vehicles
While many pet owners are aware of the risks of leaving their pets in cars during extreme weather, fewer are aware of the legal consequences. In several states, there are strict laws about leaving pets alone in vehicles, and violating these laws can result in hefty fines or even criminal charges. The laws vary by location, but many regions have enacted regulations to prevent animal cruelty and protect pets from harm caused by extreme temperatures inside parked cars.
For example, in some states, if a pet is left alone in a car and is found to be in distress due to the weather conditions, law enforcement or animal control officers may intervene and remove the pet from the vehicle. Depending on the severity of the situation, pet owners could face penalties such as fines, citations, or even charges for animal cruelty.
Additionally, some cities have specific ordinances that mandate pet owners never leave their pets unattended in cars, regardless of the weather. In certain places, the law even allows bystanders to break into a vehicle to rescue a pet if they believe the animal is in immediate danger.
For a detailed look at the laws governing leaving dogs alone inside a vehicle, be sure to read our article on Laws on Leaving Dogs Alone Inside of a Vehicle. It will help you understand the regulations that vary by state and city, so you can ensure you're always in compliance and protecting your pet.
Conclusion
Leaving your pet alone in a car, whether it's the height of summer or the coldest winter day, is never a safe choice. The risks of hypothermia, the signs to watch for, and the fact that certain dogs are more vulnerable to cold stress highlight the dangers of unattended pets in vehicles. Winter, just like summer, can be deceptively dangerous for pets in cars, and it’s crucial to always consider the well-being of your furry companion.
Remember, there is no “safe” season for leaving pets alone in vehicles. Whether you're running errands or taking a quick break, it's always best to bring your pet inside with you or leave them at home in a secure, comfortable environment. And don't forget to familiarize yourself with local laws regarding pets in cars to avoid potential legal consequences.
Your pet's safety and well-being should always come first, make sure to keep them safe, whether it's by preventing exposure to dangerous temperatures or by securing them properly while traveling. If in doubt, always opt for caution and prioritize your pet's comfort and health.
FAQs
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Why Is Winter Just As Dangerous As Summer?
Winter can be just as dangerous as summer because cars trap cold air, causing the temperature inside to drop quickly, leading to risks like hypothermia and frostbite for pets.
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How Long Is "Too Long" To Leave A Dog?
Pets should never be left alone in a car for more than a few minutes, especially in cold temperatures, as they can quickly become vulnerable to cold-related injuries.
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Is It Ever Okay To Leave A Dog In A Locked Car?
It is never safe to leave a dog alone in a locked car, as both hot and cold weather can create dangerous conditions inside the vehicle.
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Can A Dog Be Left In A Car If The Windows Are Cracked?
Cracking the windows doesn't provide enough ventilation to keep a dog safe in a car. Even with the windows open, the temperature inside can still become hazardous quickly.
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What Should I Do If I See A Dog Left Alone In A Car?
If you see a dog left alone in a car in potentially dangerous conditions, contact local authorities or animal control. In some places, you may even be allowed to intervene if the pet is in immediate danger.
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What Are the Best Alternatives to Leaving My Dog in the Car?
If you need to run errands, it’s best to leave your dog at home in a safe environment. If you must take them with you, consider finding pet-friendly stores or using doggy daycare services.
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What Are Some Safe Travel Options for My Dog in a Car?
To keep your dog safe while traveling, use a pet seat belt harness or a travel crate. These options prevent distractions and keep your pet secure in case of sudden stops or accidents.




