- Border Terrier
the second photo. THE SECOND PHOTO.
The main reason is that dogs’ fur traps air which insulates them against heat. If you shave off their fur, they can’t thermoregulate as well and are MORE prone to hyperthermia/heat stress. Dogs also don’t sweat, so exposing their skin doesn’t help them shed heat unless you’re also constantly spritzing them with water (in which case, wetting their full coat, which can hold a lot more water, is still a better idea).
Also, because the undercoat grows much more quickly than the topcoat, shaving the dog will cause their undercoat to grow out sooner and be exposed to heat, sun, and air. This causes unnatural wear on the coat and will change your dog’s fur texture and make them less able to thermoregulate when the coat grows back in. (Essentially, shaving your dog makes their coat grow in funny for the rest of their life even if you only shave it once.)
The best way to keep your double coated dog cool is to keep them well brushed to remove dead undercoat. That will allow the healthy undercoat and topcoat to trap cool air and insulate the dog from heat. You can also get your dog a cooling jacket to both block the sun and provide evaporative cooling without having to actually wet your dog. I use a cooling jacket with Maulkin all summer since his dark fur heats up very easily. The coat keeps his fur much cooler to the touch, and even just wearing it dry allows him to work outside for about twice as long.
I would also like to add that a shaved dog has a higher chance of sunburn and higher chances of skin cancer and other sun related issues. A dogs coat gives them protection from the sun but when shaved they then go out with little to no protection. In a season when the sun is very dangerous. I never condone shaving a dog unless for health reasons (such as heavy matted fur and in pain do to that).
From CENTRAL & SOUTH AMERICA: Dogo Argentino (Argentina), Xoloitzcuintle (Mexico), Fox Paulistinha (Brazil), Inca Orchid, (Peru), Chihuahua (Mexico), Fila Brasileiro (Brazil), Havanese (Cuba), Cimarron (Uruguay), Mucuchies (Venezuela).