25 degrees is when you start dipping into dangerous weather, so you'll want to use caution, especially if your dog has already shown sensitivity to warmer weather than this. 20 degrees and lower is where you reach potentially life-threatening cold weather.
In cold temperatures 20 degrees and above: Large dogs (50-80 pounds) should be outside no more than one minute per degree. Medium dogs (25-50 pounds) can be outside for 30 seconds per degree.
In General
Most healthy, medium or large dogs with thick coats can take a 30 minute walk when temperatures are above 20°. Small dogs or dogs with thin coats start to become uncomfortable in temperatures below 45°. Consider limiting walks to 15 minutes for these dogs when temps fall below freezing.
As a general rule of thumb: at 45°F (7°C) and below, most dogs will dogs will start to become uncomfortable. at 32°F (0°C) and below, small, thin-coated, young, old and sick dogs should not be left outside for long. at 20°F (-7°C) and below, dogs become vulnerable to hypothermia and frostbite.
Generally speaking, dogs will be okay until the temperature drops to below 45°F. At that point, they may start to “feel” cold (and might seek out shelter or a way to stay warm). At 32°F, small dogs, elderly dogs, and dogs with preexisting health conditions should probably stay indoors.
At around 12 – 15 degrees most pets will probably be quite safe. At 10 degrees, you need to keep an eye on them as it can be potentially unsafe depending on their age, general health, and breed.
In Vets Now's assessment of temperatures for walking your dog, they state that between 20 and 23 degrees has a six out of 10 risk rating and that rigorous exercise in this heat could lead to heatstroke. An eight out of ten rating is given for 24-27 degrees celsius and they advise that extreme caution must be taken.
Although coastal Australia isn't known for especially cold weather, when the winter months arrive there are a number of steps you should take to keep your dog healthy and warm. Of course, some dog breeds handle winter weather better than others, but as the temperature drops, so does your pup's tolerance for the cold.
Keep Your House Comfortable. Some dog owners worry that the temperature inside their homes might be too cold for their dogs. Typically, most large dogs are comfortable when the home's interior hovers between 69 to 70 degrees Fahrenheit (20 to 21 Celsius).
Experts agree that it is generally safe to take your canine pal for a walk in temperatures of up to 68F, while anything over 77F is considered very risky. This is because even at temperatures as low as 70F dogs can be at risk of developing heatstroke, a high temperature that isn't caused by a fever.
What cold temperatures are safe for dogs? In general, most dogs are okay until the temperature drops to below 45°F, according to PetMD. Below that, some dogs may begin to feel uncomfortable.
Most dogs outside with you will show signs that they are cold. By shivering or holding up a leg, they indicate they would rather be somewhere else than outside.
Cold-Temperature Guidelines for Dogs
Once temperatures drop under 20 F, all pet parents need to be aware that their dogs could develop cold-associated health problems like hypothermia or frostbite when outside for extended periods of time.
How Cold Is Too Cold for a Dog? Generally, your dog will feel uncomfortable in cold temperatures below 32°F; more cold-averse dogs may start feeling uncomfortable when it falls below 45°F. When the temperature reaches this point, don't allow your dog outside for long periods.
They say that between 16 and 19 degrees is generally safe for dogs, while between 20 and 23 degree is a six out of ten risk rating. When the temperature hits 24 and 27 degrees, this risk level goes up to nine out of ten, and then to ten out of ten when the weather reaches 32 degrees and above.
The optimal temperature for most pets ranges between 18 and 22 degrees, although some dogs tend to prefer the the former, especially if they have a very generous coat. This temperature should ideally match the temperature what you set on your thermostat during winter.
Even though many cities in Australia have a reputation for heat, most still go through temperature changes that can make most dogs and cats feel uncomfortably cold. There are also some breeds of dogs and cats that have difficulty retaining heat.
All dogs can benefit from blankets. Young, old, and sick dogs need the added comfort. Small dogs, short-haired breeds, and dogs who are prone to be more cold-blooded need the extra warmth. Dogs love the comfort of having a blanket of their own, and blankets make great substitutes for dog beds.
The soft undercoat lies close to the skin and keeps your dog warm and dry. In winter this undercoat can be so thick you may have trouble finding your dog's skin. In summer, your dog should shed his soft undercoat, leaving just the guard hairs.
While the normal body temperature in cats and dogs is 38.3 to 39.2°C (101.0 to 102.5°F). Some pets and people will maintain a temperature baseline that is slightly below or above the average.
While small pups can spend a few hours outdoors in temperatures between 60ºF and 90ºF, keep outings in temperatures below 32ºF and above 90ºF to short spans of no more than 10 to 15 minutes, recommends Dr. Wooten.
The optimum temperature for the well-being of pets is between 21 and 26 degrees Celsius, both in winter and summer.
Common Signs Your Dog / Pet Is Feeling the Cold
Your pet may be shivering, trembling or cuddling into warm spaces. Dogs and cats may curl up on your bed, lounge or near the heater as they seek warmth. Pets will also start to avoid lying on cold tiles and will choose to rest in places with warm flooring or carpet.
Dogs can sleep outside in a warm, well-ventilated and cosy shelter with plenty of access to fresh, clean water. However, the SPCA recommends allowing your dog to sleep inside as dogs are part of the family. We do not recommend chaining or tethering a dog as this causes distress and injuries.