Our four-legged friends need extra care in the bone-chilling cold.
If your dog desperately wants to go outside you can let them out but make it quick.
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"Frostbite and hypothermia can set in in truly a matter of minutes so to avoid that you really want to only take them out for short potty breaks- even those northern breed dogs," said Angela Speed of the Wisconsin Humane Society.
Speed says there are hypothermia warning signs to watch for including animals that shake a lot and then stop shaking, that are really cold to the touch, and that are lethargic and have become ill.
If your animal has any of those signs Speed recommends talking to your veterinarian immediately.
Dawn Fleuchaus of the Milwaukee County Zoo says workers have taken extra measures to make sure Zoo animals are safe.
"The elk are happy to go and lay in the snow so we do what we can but they're used to dealing with it," she said.
The elk have a barn to block the wind and straw for a dry place to lie down.
The Milwaukee County Zoo will be closed Wednesday and Thursday, but workers will still be there feeding the animals, giving them their medication, and making sure they are cared for.