Do dogs really need sweaters when the weather turns? Having grown up with rough and tough farm dogs I used to scoff at such things. But of course those dogs weren’t going from inside 70 degrees to 10 below outside and they developed thick winter coats.
Here is some info and a relevant link from PetMD….
Smaller, light bodied breeds, toy breeds, and breeds that naturally have very short or thin hair coats benefit from a warm dog sweater for when they need to go outside, or for just hanging around the house. A sweater can make a significant difference in your dog’s feeling of well-being.
Do Dogs Need Sweaters in Winter? | petMD