I have a 2 year old wirehaired Vizsla and he does not seem to be bothered by the cold although he does slow down noticeably in the heat. He has energy to burn (and then some). I haven't had him out in really hard cold but he is an outside dog so he may be acclimatised. He certainly doesn't complain at all in the cold. I reckon that when they crossbred with the GWP's they introduced a bit of resilience to the breed. My GWP (from a few years ago) never seemed to notice the cold at all.
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