Here are options:
No. Bad idea. It will get wet and when it gets wet it won’t be warm or it may freeze solid. Either way, not warm or cozy.
Many people use these and dogs can make a shallow nest but they can’t truly burrow in. Can be enough for a heavily-coated dog in a mild winter region. Some dogs can be allergic to cedar shavings. Not an ideal choice for really cold regions though some people lay some on the bottom of the dog house to catch moisture.
- Pine Straw
Much like shavings.
The tried-and-true bedding for cold areas. Shake the straw out and fill the dog house full with it. This allows your dog to burrow into it making a cozy straw den for himself. Straw is available at most garden and/or farm supply stores. Change it every couple of weeks, more if it is really wet out. Keep it fluffed up and add more when it gets compressed.
Now, observe your dog. If he comes out of his house, stretches and stands head up, tail wagging then he is a happy dog. If he comes out of his house hunched over, head down, trembling then he is cold and he needs a warmer house
or deeper/better bedding.