A lot is similar to humans, accumulation has a lot to do with it.
Heat index of 104°f and wind chill of -40°f, are not that uncommon here and I have a English Mastiff, but we are out walking everyday.
Any double coated breed will do well with the cold, the try is accumulation to the heat.
Same as a single coated would do generally better with the heat and need a sweater for the cold.
If your looking at something that would take both more naturally, I would say a Boerboel, they take the heat of South Africa and do well in the Mountains of Colorado in winter.
I would not say it is a breed for very many people though do to energy, size, drool, and temper.
Heat index of 104°f and wind chill of -40°f, are not that uncommon here and I have a English Mastiff, but we are out walking everyday.
Any double coated breed will do well with the cold, the try is accumulation to the heat.
Same as a single coated would do generally better with the heat and need a sweater for the cold.
If your looking at something that would take both more naturally, I would say a Boerboel, they take the heat of South Africa and do well in the Mountains of Colorado in winter.
I would not say it is a breed for very many people though do to energy, size, drool, and temper.