Boxers should not be left outside during cold winter weather. Their short, thin coats make it difficult for them to stay warm, so leaving them out for extended periods of time can be dangerous even with shelter available.
No dog should be left outside for extended periods of time during the winter. Dogs need warmth and shelter, just as humans do. Short-coated breeds such as boxers need additional protection from the weather. Owners should monitor their boxers closely for signs of discomfort and may want to consider buying a dog coat or sweater to provide additional warmth in frigid temperatures. Leaving dogs outside too long in cold weather is against the law in many places.