It being cold outside makes Sarge go potty faster so he can come back in, I wait by the door so I can let him in right away, its not really how cold it is outside you need to worry about, but the LENGTH of time in the cold. I doubt the wind will blow and freeze a dog to death if they're out less than 5 mins, no matter how cold it is... (curse Ohio and the lake effect-snow
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They know their limit and will be begging to come in if it is too much for them.