犬の散歩には寒すぎるとどのくらいですか？

How cold is too cold to walk a dog?

It depends on their size, their coat and whether it's wet. On the Tufts weather scale, risk starts to climb below about 50°F (10°C), below 40°F (4°C) most dogs are in the "potentially unsafe" zone, and at 20°F (−7°C) and colder small dogs are in the life-threatening band^[1].

VCA's vets put it simply: below 32°F (0°C), take precautions; at 20°F (−7°C) or lower, even short walks can be risky, especially with wind chill^[2].

Dog cold weather chart: when it's too cold to walk

Find the temperature on the left and your dog's size across the top. Use the wind chill on windy days.

Then adjust, as Tufts does: one step worse for toy breeds, a puppy under 6 months or a senior; two steps worse when it's wet (rain, sleet or snow); one step better for a northern breed or a thick double coat^[1]. "Good" is a score of 0–1, "Take care" 2, "Keep it short" 3, "Stay in" 4–5.

If they're already wearing a coat, the calculator counts it the way Tufts counts a thicker coat: one step better for a fleece or sweater, or a waterproof coat on a dry day. On a wet day a waterproof coat counts two steps, offsetting the two Tufts adds for wet weather, because it keeps rain and snow off their back. Tufts doesn't score clothing, so this part is our reading.

The Tufts scale (Patronek, 1997) is a screening chart that animal welfare officers use to judge risk to dogs kept outdoors^[1]. A walk is shorter than a day outside but harder work, so we use it as a cautious guide, not a timer. Wind is folded in with the National Weather Service wind chill^[5], which describes how cold people and animals feel but is modeled on a human face. In the US, "Use my location" fills in the current hour from the National Weather Service forecast^[6]; check it against the sky outside and change anything that's off.

Signs your dog is too cold

• Shivering or whining^[2]
• Snow or ice balls packed between their toes^[2]
• Pale, blue or blanched skin on the ears, tail or toes, or skin that's raw, blistered or firm: possible frostbite^[2][3]. Don't rub it; call your vet.

How to keep winter walks safe

• Keep it short when it's bitter. Below 20°F (−7°C), VCA suggests 5 to 10 minute walks, with a coat and booties^[2].
• A coat for short or thin coats. Short-haired and small dogs benefit from a sweater or coat^[2][4]. In wet weather, pick something weatherproof^[2]: wet dogs are at higher risk of frostbite and hypothermia^[2].
• Protect the paws. Booties or paw wax help; after the walk, towel-dry their feet and wipe off de-icer^[2][4].
• Don't shave them down in winter. A longer coat is warmth^[4].
• Leash on, ID tag on. Dogs can lose the scent trail in snow, and the ASPCA says more dogs get lost in winter than in any other season^[4].

More in our guide to cold tolerance in different dog breeds.

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