Dogs kept outdoors in winter need specific care to prevent hypothermia, frostbite, and suffering from cold exposure.
Dogs that lack adequate cold weather protection suffer from hypothermia, frostbite, and the chronic pain of cold-related joint inflammation. Outdoor dogs without proper shelters endure sustained cold stress that compromises immune function and causes pain. Road salt causes chemical burns to paw pads that are painful with every step. Anti-freeze poisoning causes kidney failure with prolonged suffering before death. The legal standard for outdoor dog shelter varies by jurisdiction but the welfare standard should be set by what is needed to prevent suffering rather than what is legally minimum. Dogs are social animals that suffer from outdoor isolation in addition to physical cold stresses.