Are you planning to buy your Sheltie a blanket for the colder weather months? If so, you should look for blankets that are suited for the outdoors. Many pet store blanket option are meant more for show than for outdoor wear. For instance, the Rambo horse blanket brand makes durable blankets for dogs like the Sheltie. These blankets tend do well for dogs that spend time outdoors. If you choose to purchase this type of dog blanket you will need to be familiar with terms such as weight and fill. The weight or fill refers to the amount of stuffing used in the blanket to provide warmth. If you are looking for a rain sheet to keep your Sheltie dry then you should choose a light. A blanket with a heavier fill will provide protection and warmth. Ask your veterinarian Scottsdale, AZ for more details.