Don’t think that your pet is automatically warmer than you just because they have fur lining their body. Think of that fur as their skin, or their clothing, which may not be enough to protect them from the elements. The general rule of thumb for the cold season is that if you’re feeling cold, your pet’s probably feeling the same.
When the temperatures start plummeting, you should keep your dog indoors as much as possible. If they’re more an outdoors kind of dog, you might look into giving them a heated kennel or heater that wouldn’t harm them. If you don’t take these steps, your dog might contract pneumonia or hypothermia.
If you have to go out and leave your dog alone at home, set the heating to at least 68 degrees Fahrenheit (20 degrees Celsius). This would ensure that they don’t get too cold while waiting for you to come home.