Most dogs are fine down to about 45°F. Below 32°F, small dogs, thin-coated dogs, puppies, seniors and dogs with health conditions start getting into real trouble. Below 20°F, almost any dog can. Those three numbers turn up on nearly every page you’ll find on this question, and they’re a reasonable place to start.
They’re also only half the answer. An 85-pound Malamute and a 7-pound Chihuahua standing in the same 30-degree yard are not having the same afternoon, and neither is a wet dog compared to a dry one. Vets have had a proper tool for this for more than twenty-five years, and it isn’t a number. It’s a scale you adjust for the dog in front of you, and one state has written it directly into law. Here’s how to work out your dog’s number.
The short version
- 45°F is when cold-sensitive dogs start to feel it. 32°F is when small, thin, young, old or unwell dogs are genuinely at risk. Below 20°F is risky for nearly every dog.
- Size and coat move that line further than anything else. Wind and a wet coat move it more than most people expect.
- Shivering means bring them in. A cold dog who has stopped shivering and now seems weak or dazed is worse off, not better.
- Most thin-coated dogs shouldn’t be out in freezing weather for more than 10 to 15 minutes without somewhere warm to go.
- In five states and Washington DC, an actual temperature is written into the animal cruelty law.
Jump to a section
- The temperature guide, by size and coat
- Five things that move the number
- How to tell if your dog is actually cold
- How long is too long outside
- Dogs who sleep or live outside
- Hypothermia and frostbite
- The winter dangers that aren’t about temperature
- Where it’s actually illegal
- Frequently asked questions
The temperature guide, by size and coat
Find today’s temperature down the left, then read across to the column that matches your dog. If your dog sits between two columns, use the more cautious one.
| Temperature | Small, thin-coated, senior, puppy or unwell | Medium to large, average coat | Thick double coat |
|---|---|---|---|
| Above 50°F | Comfortable | Comfortable | Comfortable. Watch for overheating on a hard run |
| 45 to 50°F | Fine for most. A few dogs will want a coat | Comfortable | Comfortable |
| 32 to 45°F | Coat weather. Keep walks short and brisk | Fine for normal walks | Comfortable |
| 20 to 32°F | Bathroom breaks only, 10 to 15 minutes at most | Short walks. Check the paws afterwards | Fine for moderate activity |
| 0 to 20°F | Indoors. Quick supervised trips out | Bathroom breaks and short walks only | Limit the time out. Check ears and paws |
| Below 0°F, or hard wind chill | Indoors only | Indoors. Brief bathroom breaks | Brief trips only, northern breeds included |
Notice that the same row means four different things. That’s the point, and it’s why a single number can’t answer this question honestly. A Husky at 25°F is having a nice time. A Greyhound at 25°F is not.
If your puppy isn’t full grown yet, the column you belong in is going to change over the next several months. Our puppy growth chart will tell you roughly where your dog is heading.
Five things that move the number more than the number does
The best tool for this isn’t from a pet blog. It’s the Tufts Animal Care and Condition scales, designed by Gary Patronek, VMD, at the Tufts Center for Animals and Public Policy and written for veterinarians, animal control officers, police and cruelty investigators. Its Weather Safety Scale runs from 1 to 5, plots temperature against the dog’s size, and then tells you to adjust the score for the specific animal. Those adjustments are the part everyone skips.
| What changes | What it does to the risk |
|---|---|
| Being a toy breed | Tufts adds a full point. Small bodies lose heat fast because they have a lot of surface area for very little mass. |
| Rain or sleet | Adds two points, the single largest adjustment on the scale. A wet coat stops insulating almost completely. |
| A northern or heavy-coated breed | Subtracts a point. A double coat is genuine insulation, not decoration. |
| Real shelter and dry bedding | Subtracts a point. A dry, wind-proof, raised box with deep bedding is worth roughly as much as a thick coat. |
| Being acclimated to the cold | Subtracts a point. A dog who has been outside daily all autumn copes better than one going out for the first time in months. |
Two more factors sit outside the Tufts list and matter just as much. Wind strips away the warm layer of air held in the coat, which is why a still 20°F day is kinder than a windy 30°F one. And health changes everything: the American Veterinary Medical Association notes that pets with diabetes, heart disease, kidney disease or hormonal problems like Cushing’s disease have a harder time regulating their body temperature.
Hypothyroidism deserves its own mention, because it hits from two directions at once. It slows the metabolism that produces body heat, and it commonly thins the coat that holds that heat in. A dog who suddenly seems to feel the cold far more than last winter is worth a vet conversation, not just a warmer sweater.
One thing to skip: a wet sweater. The AVMA is blunt about it, warning that wet sweaters or coats can actually make your dog colder. If the coat comes home soaked, take it off at the door rather than leaving it on to dry.
How to tell if your dog is actually cold
Dogs are worse than us at complaining and better than us at hiding discomfort, so it’s worth knowing the list. Cornell’s Riney Canine Health Center lists these signs a dog is too cold:
- Shivering
- Whining or barking
- A tucked tail or hunched posture
- Lifting paws off the ground
- Reluctance to keep walking
- Sudden anxious behavior
Lifting paws is the one people miss most often. A dog who keeps picking up one foot, then another, isn’t being dramatic. Those pads are in pain.
Shivering is also just one of many reasons a dog shakes, and the others range from harmless to urgent. If your dog trembles indoors where it’s warm, the cold isn’t the explanation and our guide to why dogs shake works through the rest.
The counterintuitive part, and the most important thing on this page. Everyone says to watch for shivering, and you should. But the Merck Veterinary Manual points out that shivering is not usually a sign of hypothermia in pets the way it is in people. A genuinely hypothermic dog tends to act weak or disoriented, breathe shallowly, and have a slow pulse. So a cold dog who was shivering and has now gone still is not settling in. Shivering means take them inside. Shivering that stops while the dog is still cold means call a vet.
How long is too long outside
There’s a usable number for this one. Dr. Linda Martin, an emergency and critical care specialist at Washington State University’s Veterinary Teaching Hospital, advises that most dogs and cats, especially those with thinner coats, should not be exposed to freezing temperatures for more than 10 to 15 minutes without access to a warmer space.
Ten to fifteen minutes is shorter than most winter walks. That doesn’t mean a healthy Lab can’t go longer, but it does mean the default assumption should be short trips with a warm place waiting, and anything beyond that is a decision you make deliberately for a dog you know can handle it.
Two practical adjustments. If your dog has spent the autumn indoors, build up rather than starting with a 40-minute walk on the first freezing day. And time the walk for the warmest part of the day, which in winter is early to mid afternoon rather than dawn or after dark.
Dogs who sleep or live outside
This is a different question from walks, and the answer is stricter, because the dog can’t come inside when it gets bad.
A dog house on its own isn’t shelter. Useful shelter has four features, and it’s worth checking all of them: it’s raised off the ground so cold doesn’t conduct up through the floor, it has a wind-proof doorway such as a flap, it’s small enough for the dog’s own body heat to warm the space, and it’s packed with dry bedding the dog can burrow into. Straw works well for this. Blankets and towels are worse than they look, because they hold moisture and then take heat away rather than adding it.
Water is the other half. Bowls freeze, and a dog that can’t drink gets dehydrated, which makes it harder to stay warm. Check it rather than assuming.
Honestly, though, below freezing, most dogs shouldn’t be sleeping outside at all. Northern breeds with proper shelter are the exception rather than the rule, and puppies, seniors, thin-coated dogs and any dog with a health condition are not candidates in any weather that cold.
Hypothermia and frostbite, and what to do right now
A dog’s temperature normally sits around 101 to 102.5°F. WSU’s veterinary teaching hospital sorts hypothermia into three bands: mild at 90 to 99°F, moderate at 82 to 90°F, and severe below 82°F. Moderate and severe are emergencies.
Get them somewhere warm and dry
Inside, off the cold floor. Take off anything wet, including a soaked coat, and towel-dry them.
Warm them gradually, not fast
Blankets, and a warm water bottle wrapped in a towel against the chest. No hair dryers, no heating pads directly on skin, no hot water. Warming too aggressively causes its own problems.
Call the vet if anything is off
Weakness, confusion, shallow breathing, or shivering that has stopped while the dog is still cold. Don’t wait to see if it improves.
Frostbite is the slower danger and it’s easy to miss on the day. It hits the tips of the ears, the feet and the tail, and Merck notes that affected skin may look pale or red, swollen and painful, and in severe cases can eventually turn black and fall off. WSU adds a tell that’s easier to spot in the moment: frostbitten paws hurt, so the dog may prance oddly as it walks.
The important thing about frostbite is that it announces itself late. Damage often isn’t obvious for a day or more, so if you suspect it, get the dog seen rather than waiting for something to look dramatic. Rewarming should be gentle and use warm, not hot, water.
If you’re not sure whether what you’re looking at needs an emergency room or a morning appointment, a video visit can help you triage it, though what a remote vet is allowed to do depends on your state. Our state-by-state guide to pet telehealth covers where that’s permitted.
The winter dangers that have nothing to do with temperature
A mild winter day can still be a bad one.
Antifreeze is the serious one. Ethylene glycol tastes sweet, dogs will drink it, and the AVMA warns that even small amounts can be deadly. It also turns up in windshield de-icer, not just in radiators. Treatment works far better the earlier it starts, because the antidote blocks the poison from being converted rather than repairing kidneys that have already been damaged. If you think your dog got into any, that’s an immediate emergency call, not a wait-and-see.
Ice melt is more common and less dramatic. It dries out and irritates paw pads, and the bigger risk is what happens next, because dogs lick their feet clean. The ASPCA notes that swallowing ice melt usually causes stomach upset, vomiting and diarrhea, and that enough of it raises sodium levels far enough to cause tremors and seizures. Products sold as pet-friendly are generally urea or magnesium chloride, which the ASPCA calls safer ingredients that may still cause stomach upset. Gentler, in other words, not harmless. Wiping the paws at the door with a damp cloth handles most of this.
If the paw licking carries on well after the salt is rinsed off, the salt probably isn’t the cause. Persistent paw licking usually points somewhere else.
Cars cut both ways in winter. A parked car chills fast and holds the cold, so it’s no safer to leave a dog in one in January than in July. And outdoor cats climb into warm engine bays, so banging on the hood before starting the engine is a habit worth having even if you only own a dog.
Where leaving your dog outside is actually illegal
Most states require shelter but never say how cold is too cold. A handful put an actual number in the statute, and the mechanisms are not the same, so it’s worth reading what each one really does rather than assuming they all ban the same thing.
| Where | Number | What the law actually does |
|---|---|---|
| Virginia | 32°F | At or below 32°F, tethering a dog outdoors no longer counts as providing adequate shelter. |
| Maryland | 32°F | Below 32°F, a dog can’t be left outside unattended more than 30 minutes without suitable shelter. |
| New Jersey | 32°F | Unlawful to expose or tether a dog for more than 30 minutes at or below 32°F. |
| Washington, DC | 32°F and 40°F | 15 minutes outdoors in extreme weather. At 40°F and below, shelter must have a windproof flap, a floor raised off the ground and dry bedding deep enough to burrow into. |
| Pennsylvania | 32°F | A safe-harbor rule, not a ban. Tethering is presumed not to be neglect only if it stays under 30 minutes below 32°F. |
| Delaware | 35°F | At 35°F or lower, extra bedding and a windbreak become required, as they are from November through March. |
| Rhode Island | By reference | Bans outdoor confinement beyond what the Tufts Animal Care and Condition Weather Safety Scale allows. The scale itself is the legal standard. |
| Maine | No number | Uses the dog instead of the thermometer. Shelter is inadequate if the dog shivers from cold for 10 continuous minutes, or shows frostbite or hypothermia. |
Rhode Island is the interesting one. Its statute doesn’t pick a temperature at all. It points directly at the Tufts Weather Safety Scale, the same tool most pet articles quietly copy without crediting. A state legislature reached the same conclusion this article opened with: temperature alone isn’t a workable standard, so use the scale that adjusts for the dog.
Maine gets there from the other direction, and its test is the most useful one for an ordinary owner. Ten minutes of shivering is the line. You don’t need a thermometer to apply that.
One correction worth making, because it’s repeated constantly: Texas is often listed as a 32°F state. That provision was repealed in 2022 and replaced with an adequate-shelter standard carrying no temperature at all.
Frequently asked questions
What temperature is too cold for dogs?
As a starting point, 45°F is where cold-sensitive dogs begin to feel uncomfortable, 32°F is where small, thin-coated, young, old or unwell dogs are genuinely at risk, and below 20°F is risky for nearly every dog. Adjust from there for your dog’s size and coat, and for wind and wet, which matter more than most people expect.
How can you tell if your dog is cold?
Watch for shivering, whining, a tucked tail or hunched posture, lifting paws off the ground, reluctance to keep walking, and sudden anxious behavior. Paws tend to give out before the rest of the dog does, because the pads sit in direct contact with frozen ground and have very little insulation of their own. The clearest signal you’ll get is behavioral: a dog who stops and turns back toward home is telling you the walk is over.
How cold is too cold for a dog to sleep outside?
For most dogs, anything below freezing is too cold to sleep out, and only heavy double-coated northern breeds with real shelter are reasonable exceptions. If you want a specification to build to rather than a judgment call, copy the one Washington DC puts in its animal law for 40°F and below. The thing owners most often miss is maintenance rather than construction: wind-driven snow blows through the doorway during a storm and soaks the bedding, and damp straw pulls heat out of a dog instead of holding it in. Check it after weather, not just at the start of winter.
How cold is too cold to walk a dog?
Between 32 and 45°F, most dogs walk normally and small or thin-coated dogs want a coat. Between 20 and 32°F, keep small and thin-coated dogs to bathroom breaks and give larger dogs short walks. Under 20°F, no dog should be out long, whatever its coat. Wind chill counts, so go by what it feels like outside rather than the forecast number.
How long can a dog stay outside in freezing temperatures?
Roughly 10 to 15 minutes for a thinner-coated dog, per the guidance from Washington State University’s veterinary teaching hospital. Two things worth knowing about that figure. It counts from the moment you leave the door, not from when you get to the park, so a ten-minute walk to the park has already used it up. And it assumes there’s somewhere warm to come back to. If there isn’t, the number stops being a time limit and becomes a reason to keep the dog in. Puppies and seniors should be well under it.
Do dogs actually get cold?
Yes. A fur coat isn’t unlimited insulation, and it stops working almost entirely when it’s wet. Dogs also can’t tell you they’re cold, which is why the physical signs matter more than the assumption that they’re built for it.
Is 40 degrees too cold for a dog?
For most healthy medium and large dogs with an average coat, no. For a small or thin-coated dog, a puppy, a senior or a dog that’s unwell, 40°F is coat weather and walks should be shorter than usual. Add wind or rain and 40°F becomes meaningfully harder for any dog.
Which dogs handle cold best and worst?
Best: heavy double-coated northern breeds like Huskies, Malamutes and Samoyeds, and large dogs generally, because a bigger body loses heat more slowly. Worst: toy breeds, thin-coated breeds like Greyhounds, Whippets and Vizslas, very lean dogs, puppies, seniors, and dogs with hormonal, heart or kidney conditions.
Does my dog need a coat or booties?
A coat genuinely helps small, thin-coated, very lean, old or unwell dogs, and it does little for a Husky. Take a wet coat off at the door, because a soaked one makes a dog colder. Booties are worth it mostly for ice-melt exposure and for arthritic dogs who need traction on ice. If you use them, use all four rather than one, and expect a habituation period.
Does cold weather make dog arthritis worse?
It’s widely believed, and it may be true, but the evidence is thinner than the confidence around it. There’s no canine study demonstrating it, and the human research disagrees with itself, with the larger and more recent analysis finding no link between weather and joint pain. What is well established is the mechanical problem: ice is slippery, and arthritic dogs slip. Cornell recommends well-fitting booties for traction and shovelling out part of the yard so there’s sure footing.
Can dogs catch a cold from being out in cold weather?
Not directly. Cold air doesn’t cause infection. Dogs do get respiratory infections like kennel cough, and those spread more in winter mostly because dogs are gathered indoors together more often. If your dog develops a runny nose, a cough or sneezing after cold weather, that’s an infection or an irritant to investigate, not a chill.
Is cold water bad for dogs?
Drinking cold water is fine and doesn’t cause bloat, despite the persistent rumour. Swimming in cold water is a different question, because a wet coat stops insulating and a dog can become hypothermic quickly, especially a lean or small one. If your dog swims in winter, dry them thoroughly and get them somewhere warm afterwards.
The bottom line
45, 32 and 20 are useful numbers, and they’re where to start. But the honest answer to how cold is too cold is that it depends on which dog is standing in the cold, how wet and windy it is, and how long they’ll be out there. That isn’t a dodge. It’s what the professional scale has said for decades, and it’s what Rhode Island wrote into law.
If you want one thing to remember: Maine’s version. If your dog shivers for ten minutes straight, it’s too cold, whatever the thermometer says.
Last reviewed September 10, 2026. We’re pet people, not veterinarians. This article is general information and isn’t a substitute for advice from your own vet, who knows your dog. If you think your dog is hypothermic or frostbitten, call a vet or an emergency clinic now.