I love in mn/wi is get stupid cold here this will be Loki's 3rd winter here and he doesn't have a sweater but he also is not out very long either. It might not be a bad idea if you place. On having them out often also one thing that I will recommended is booties. Loki hates them but if were going out for a walk he knows he has to have something on his feet so they stay warm and he doesn't slip.
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Btw you have the cutest babies ever