Of course, short, thin hair is not the only prerequisite for outer clothing. Dogs that tend to have short-cropped hair — like poodles, which may grow thick hair but which owners tend to keep short to avoid matting — should also be given a sweater to protect them from very low temperatures. Also, older dogs with weaker immune systems and dogs with diseases that impair hair growth (i.e., Cushing’s disease, hypothyroidism) typically need an extra source for warmth, and this can be easily provided by a sweater or jacket, even indoors.
Conversely, larger dogs with dense hair coats do not have a need for additional insulation, and would be very uncomfortable if they were forced to wear outer clothing, possibly to the point of physically overheating. Their fur is already genetically designed to protect them from extreme winter temperatures. The Siberian Husky, Malamute, and Saint Bernard breeds are all excellent examples of dogs that are perfectly suited to cold temperatures, while the Chihuahua, Greyhound, and many terrier and pinscher breeds are good examples of dogs that would do well with a little extra outer insulation.
Finding a Good Sweater
Once you have decided to get a sweater for your dog, you will need to begin by considering material. While wool is very warm and one of the best insulating materials, take into account how often it will need to be washed, and whether it will make your dog more uncomfortable due to itching. A good blend of washable wool and cotton or acrylic may be the best bet.
Second, just as you would measure your own neck, chest and waist before buying a piece of clothing, measuring your dog is the best way of assuring the best fit. Why do you want it to fit? So that your dog cannot easily pull the piece off, so it doesn’t drag on the ground, and so it doesn’t get caught on anything during normal movement. You want the piece to be snug without being tight.
The most important areas to measure are around the neck, around the largest part of the chest, and the distance from the neck to the waist. The sweater’s length should end around the waist, leaving the area below free. Knowing your dog’s actual weight will also help you to determine the correct size. If possible, take your dog along to the store with you try the clothes before buying them, as returns are very difficult when it comes to clothing for animals.
Next: More important sweater considerations