Should dogs be trimmed during the winter period?

I have a Shih Tzu dog breed. Last year, during the winter period, the groomer cut my dog's hair too short. I used to put on him a little coat for walks, but even with a slightly open window, he could still shiver. Should I leave longer hair on my dog during the winter period, or is he resistant enough to be normally trimmed?
I have a Shih Tzu dog breed. Last year, during the winter period, the groomer cut my dog's hair too short. I used to put on him a little coat for walks, but even with a slightly open window, he could still shiver. Should I leave longer hair on my dog during the winter period, or is he resistant enough to be normally trimmed?
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