I have one who goes nekkid year round and one who has to wear something for protection, even in the summer months. Gage has absolutely no undercoat and barely has any hair whatsoever on his back and towards his hind legs. Through various tests at the vet, no explaination can be found so, per vet instructions, Gage either has to wear sunscreen when he goes out or a light weight t-shirt during the summer and something heavier and warmer when it's cold outside. As others have said, those who stare are either adoring our precious babies or wondering if we lost our minds. Well, of course we've lost our minds over these babies!! Keep putting the sweaters and coats on