Frostbite picks the extremities first
Frostbite happens when tissue freezes, and the body sacrifices the farthest parts to protect the core, so look where blood flow is thinnest: the tips and edges of the ears, the end of the tail, the toes and pads, and in male dogs the scrotum. Freshly frostbitten skin looks pale, white, grey, or faintly blue compared with the skin beside it, and it feels cold, firm, or waxy to the touch. The dog may show surprisingly little pain at first because frozen tissue goes numb — which is why a visual and fingertip check after time in serious cold matters more than waiting for him to complain.
Frostbite changes as it thaws, over hours and days
The deceptive part of frostbite is that its full extent hides. As circulation returns, affected skin often becomes red, swollen, and painful, then may blister or form dark, shrivelled patches over the following days where tissue has died. A paw that looked merely pale on the walk home can declare a serious injury by the weekend. That delayed timeline is a reason to have any suspected frostbite assessed promptly rather than adopting a wait-and-see approach, and to photograph the area so changes are obvious rather than argued from memory.
Hypothermia is the whole dog cooling down
Hypothermia is different: the core temperature itself falls, and the signs are whole-body and progressive. Early on a dog shivers hard, seeks warmth, and may whine or seem anxious. As cooling deepens he becomes lethargic, weak, and clumsy, muscles stiffen, breathing and heart rate slow, and the shivering can stop altogether — a dangerous sign, not an improvement, because the body is failing to generate heat. Puppies, small and lean dogs, short-coated breeds, and elderly dogs cool fastest, and a wet coat in wind strips heat far quicker than dry cold alone.
First steps while you get veterinary help
Bring the dog indoors or into a warm vehicle, dry him if he is wet, and wrap him in dry blankets, adding a covered warm — not hot — water bottle against the body if you have one. Frostbitten parts can be warmed gently in lukewarm water, but never rub or massage them, never use a hairdryer or radiator heat on numb skin, and do not warm an area if it might refreeze before you reach help. Offer lukewarm water to a dog who is alert enough to drink, skip food for a drowsy dog, and contact a veterinarian promptly: both conditions can sit alongside low blood sugar, shock, or underlying illness that only an examination will find.
Prevention that respects real winter life
Shorten outings in bitter or windy cold, dress short-coated and elderly dogs in a fitted coat, use boots against ice and frozen ground, and never leave a dog in a cold car or tied outside a shop in winter. Back indoors, make a habit of checking ears, tail, and paws while you towel him down. If a cold-weather scare does end in a clinic visit, KinsLe's Pet Passport keeps his vaccination and health records together in one portable packet, so the vet treating him can see his background without you reconstructing it from memory in the waiting room.