Cold Weather Safety for Dogs: Insights from a Sled Dog Veterinarian

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By Sophia Yin, DVM, MS

Some dogs were bred for cold weather and enjoy being outdoors.

Brrr. It’s below 20° and the only sane place for a person is sitting inside in a nice cozy, heated home. But what about your dog? While I generally recommend all pets stay inside too, some dogs love being outdoors and were bred for cold weather—when is it safe for dogs to stay outside in the cold?

I had the extreme good fortune to meet veterinarian, Dr. Susan Whiton on a recent trip to Anchorage, Alaska. She provided a personal tour of her sled dog kennel and told me how she and her husband, top musher Vern Halter, own Dream a Dream Iditarod Sled Dog Kennel. For 21 years Vern has raced the Iditarod or Yukon Quest. He has placed in the top 5 of the Iditarod three times and the top 10 eight times.  Susan Dream A Dream Dog Farmhas focused most of her work attending to the dog’s medical and health needs.  In addition to her veterinary degree, Susan has completed the IVAS animal acupuncture course and studied both canine physical rehabilitation as well as osteopathy. Susan has even raced in the Yukon Quest herself, just for fun! So I knew there was no one more qualified to answer your questions about dogs in cold weather than Susan!

Here are some of Susan Whiton’s tips on cold weather safety for dogs.

Q. Which dogs can tolerate cold weather?

A. The animal’s ability to tolerate really cold weather depends on age, nutritional status, health and coat density. The northern breeds with the thick undercoat do the best: Siberian Huskies, Alaskan Huskies, Malamutes, etc.  

My Gordon Setter (long since passed away) could be outside in a well-strawed dog house at 20° below for the 8 hours when I was at work, but she slept inside at night and she was on a high-fat, high-protein performance dog food.  She lived in Alaska her adult life and grew a thick coat over the winter.

JesseMy current border collie Jesse tolerates the cold temperatures very well.  Her coat is very thick and she eats the same high-energy food and high fat treats that the sled dogs do. She can be outside all day in the bitter cold but comes inside at night.

My 15-year old border collie can only be outside for 15 – 20 minutes before she starts shivering.  When she was younger she was just like Jesse in her tolerance for cold.  

Puppies under 8 weeks of age do not tolerate the deep cold at all even the double-coated breeds. Their ability to regulate their body temperature does not even begin to develop until they are around 2 weeks of age. As they start to eat solid food we start taking them out for monitored amounts of time. We have some 8 week old pups that are outside all day long if it is – 10°F or warmer. If we see them just huddling in their dog house and not playing we bring them back inside. Health, nutritional status, diet, thickness of hair-coat and body mass affect how quickly they will develop a tolerance to the cold. A thick-coated fluffy Pomeranian at one pound will not be able to tolerate the cold as well as the 10 pound husky pup.

Q. How do you know when it’s too cold for your dog?

A.  If your dog is shivering or refusing to come out of its dog house or a curled position it is probably too cold.

Q. What diet should they eat if they are outside for long periods during the day?

A. The calories in most commercial dog foods come from carbohydrates. In very cold weather, the dogs do better with a higher amount of fat calories. A study indicated a sled dog racing the Iditarod required 10,000 calories a day to meet their metabolic needs. The only way to meet that high caloric need is with a diet high in fat calories. Most pet dogs do not need that many calories and may get very sick from a high fat diet.

During the race… High fat diets are essential for meeting the caloric needs of these super athletes.   Photo by Susan WhitonWhen I ran the Yukon Quest in 1987 we encountered -55° F temperatures at night and -20° F during the day. The sled dogs did fine at those temperatures. They were being fed a very high fat, high calorie diet up to four times a day during the rest periods and often got fatty meat snacks during the runs.And at home… These puppies have just been on an off-leash country frolic. Now it’s chow time. They’re waiting for their high fat, high calorie diet.

Q. How are dogs with a thick undercoat able to keep warm when sleeping?

A. When they sleep they curl up with their tail over their nose, which traps the heat against their bodies. There are lots of photos of resting sled dogs covered with snow. They are holding their heat well since the snow is not melted. The dogs that are not doing well will have ice on their fur. It indicates that they are losing enough body heat to melt the snow. Because their coat is not insulating well more ice will build up making the hair less lofty and less insulating. The thick undercoat of the Northern Breeds provides loft, like a fuzzy mohair sweater, and keeps the warmth next to the animal rather than allowing it to escape. The Iditarod sled dog race only allows Northern Breeds in the race because other breeds can’t retain heat well. So when the ice hits their coat it melts and then freezes.Thick undercoats on northern breeds provide loft and keep warmth next to the dog.

Q. What type of housing is warm enough for sub zero temperature?

A. Our sled dogs have individual houses big enough for them to move around inside but small enough to allow them to be warmed with body heat. The houses all have legs that raise them off the ground. The space under the houses provides insulation from the frozen ground. We constantly monitor the straw to keep it dry because damp straw would soon be frozen to the bottom of the doghouse which would be frozen to the ground making it harder to keep the bedding dry.

There is a thick layer of straw inside every house and we add new straw at every cold snap to replace the loft. The old straw is removed and replaced with new straw several times over the winter because it will get damp from the snow that the dogs bring in on their fur. Wet straw loses its ability to insulate. It is important that the dryness of the straw be monitored and replaced if it gets damp. Sometimes the boy dogs miss when they mark the corner of their houses and the straw gets wet from other liquids.Dog houses are big enough for movement inside but small enough to be warmed by the dog’s own body heat.

Q. How do you keep dogs warm during a race?

A. Cold is not a problem when the dogs are running during the race. Overheating is a bigger problem for the sled dogs. I raced in the Rocky Mountain Stage Stop Race out of Jackson Hole, Wyoming. The temperatures there were often in the high twenties and low thirties. My cold weather dogs from Alaska had trouble with the heat. They got frozen meat water as treats rather than fat as a snack to keep them cooler. Think of a hardy Minnesotan running the Ironman in the heat and humidity of Hawaii. It must have been like that for my dogs.

The dogs do need to stay warm when they stop at the checkpoints for their rest. There is a fresh bale of straw for every team at every checkpoint on the Iditarod. Every musher will make straw beds for the dogs at every rest. Many mushers also have fleece dog coats and blankets to put on top of the dogs as they sleep for extra warmth. Vern (my husband) had special insulated dog coats with pockets on the inside for hand warmers. He used these coats at the 24-hour rest period to provide extra warmth so the dogs would be warm without curling up. They could sleep warm with their legs and back stretched and relaxed, allowing for better recovery. The dogs sleep on the line and sometimes curl up with the neighboring dogs but usually just snuggle into their individual straw beds.  Vern puts special insulated coats with pockets for hand warmers on the dogs so instead of curling up, they can sleep stretched out for a more restorative sleep.  Photo by Susan Whiton

The sled dogs will wear nylon and fleece coats during the run in windy weather to protect the un-haired parts on the underside. The tip of the sheath on males is vulnerable to frost bite in very cold weather when it is windy. The booties protect the feet from the abrasive snow but they do not add warmth. In very cold temperatures the snow becomes harsh like sandpaper and the dogs must wear booties to protect their feet.Vern is leaving a check-point and all the dogs are booted.   The boots protect their feet from the snow that is so cold it acts like sandpaper on their pads.   The boots do not provide any warmth.  Photo by Susan Whiton

So there you have it. Insights from an expert. While, I know, my little JRT would not enjoy sleeping in the cold, but for dogs bred for and raised in cold climates, the story is different. Whiton adds, “It is hard for humans who think 30 F is cold to imagine dogs doing well at -30° F.  But the dogs do amazingly well if they are acclimated, healthy, fed well and housed well.”

To learn more about cold weather safety for dogs, read Six Cold Weather Tips in Dogs and Cats and Cold Weather Safety in Dogs and Cats.


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14 responses to “Cold Weather Safety for Dogs: Insights from a Sled Dog Veterinarian

  1. Really awesome concept cold weather safety for dogs. There was no one more qualified to answer questions about dogs in cold weather than Susan! Thanks!

  2. I have two Siberians, a year old. I live in the foothills outside of Denver, Colorado at around 7500 feet, so it gets below zero fairIy often in the winter. I know they love it outside in the snow, and probably prefer it, but I like having them inside, in crates, at night. But will that interfere with their body’s thermal regulation, and stop them from growing a heavy coat? It is better to let them stay outside at night? I have a well insulated doghouse under my deck, so they have protection from wind and rain. .

  3. I’m in the same situation as DJ Himstedt. I have a Siberian husky that I like to keep in with me at night but during the day he is in a really nice run with a roof and straw in his box. However, I do worry about screwing up his bodies thermal regulation and don’t want him to be cold when he’s out there. Is it OK to be bringing him in and out?

  4. I have a twenty month old long haired German Shepherd bitch who has slept outside since when I got her at four months old .
    I have had a large dog run built for her and she loves it Ive recently put a duvet in for her to sleep on and she has slept in later for several hours I had to wake her its very cold
    at the moment is it safe for her to stay outside I dont want to disrupt her routine she walks into her bed at 11am every night and I dont hear a peep until the next morning.

  5. I have a 50 lbs female Siberian Husky and I wish to visit somewhere that will be ideal for both of us. My only requirements are that there is lots and lots of sunshine and plenty of hiking trails that will be fun for her and challenging for me. Neither one of us can stand grey skies, rain, heat or humidity. We are looking for a place where we can enjoy being outside all day long.


  6. We have a litter of nine Mals born the 4th of November. We would ideally like to move them to the outside shed as they get mobile and harder to clean up after. It is a stone shed with no door, so they can go in and out to potty, but have a dry safe place to sleep.

    Temperatures here have been down to 3 (37f) at night and up to 11(50) in the day.

    Would it be safe to put them outside with their mama?

  7. I have a husky that loves being outside in colder weather and I live in Missouri. But I had several people tell that she can be outside.

  8. We have a husky/yellow lab mix. He is 21 months old. We are giving him food from a company called Zignature, a it provides low glyciminc nutrition. He also gets egg, kefir, vegetable, or other foods.
    Is this good enough or do we need to do more?

    He likes the outdoors, has an undercoat but not as thick as a husky’s..
    We leave him outside when it is cold as long as it is not extreme or wet. He has a doghouse with straw. Any recommendations beyond this?

  9. We have a husky/yellow lab mix. He is 21 months old. We are giving him food from a company called Zignature, a it provides low glyciminc nutrition. He also gets egg, kefir, vegetable, or other foods.
    Is this good enough or do we need to do more?

  10. hi I have a senior Husky( 10 year old), she sheds a lot throughout the entire year, we thought it was because the indoor warmth, right now in Toronto where we live,it is -9 (C) to -18 plus windchill, should we keep leave her in the garage or any other suggestion? Much appreciated

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