Working breeds that are active during the winter
Dogs which are kennelled outside
Thin-coated breeds like greyhound, whippet or Chihuahua feel the cold more than others
Old dogs may not thrive as well and can often lose weight during the winter.
Small dogs have a larger surface area to volume ratio than big dogs so essentially, this means they have more skin, meaning they get colder more quickly and may require more fuel
The more body fat a dog has, the greater its insulation and the longer that dog will stay warm.
Dogs which are unwell will feel the cold more than a healthy dog