Can my dogs be in a snowy (really cold) environment?

i am going to the mountains (where it is snowing) tomorrow and i am taking my 2 dogs both female, a gsd/rottie mix who i 1 year old and a terrier mix who is around 2 years old. Would it be safe to take them with me to the mountains where it is really cold and snowy? Should i buy them doggie sweaters or will they be... show more i am going to the mountains (where it is snowing) tomorrow and i am taking my 2 dogs both female, a gsd/rottie mix who i 1 year old and a terrier mix who is around 2 years old. Would it be safe to take them with me to the mountains where it is really cold and snowy? Should i buy them doggie sweaters or will they be allright?
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