What do you do to keep your dog warm in cold weather conditions?

I live in Florida and I own a Labrador retriever and it's going to be 49°, and 30° tomorrow night. My dog seems to be cold... he's laying in the dirt in our backyard near our house, so we put a shirt on him. I'm just wondering do these type of dogs get cold in this type of weather? Is the dirt warm to... show more I live in Florida and I own a Labrador retriever and it's going to be 49°, and 30° tomorrow night. My dog seems to be cold... he's laying in the dirt in our backyard near our house, so we put a shirt on him. I'm just wondering do these type of dogs get cold in this type of weather? Is the dirt warm to these dogs?
Update: (he has a dog house)
Update 2: (everytime we give him a sheet or quilts he just tares them up and we have a mess to clean up in the morning.)
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