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The best solution is to put a dog bed in your living space, a comfy spot to rest that’s all her own. During the initial house-training phase, though, she should spend the night in a crate in your bedroom. There’s a mind-boggling selection of doggy beds on the market, so take your time choosing the one that’s right for you and your pooch. As in the case of real estate, location counts most when it comes to a dog bed. If your pup’s sleeping accommodation is on carpet or hardwood, you won’t need a lot of padding in the bed, but if it’s on concrete, linoleum or tile, you’ll need an adequate barrier against cold and moisture between the floor and the bottom of the bed. If your pooch sleeps in the basement or some other area where the temperature will be dipping below 60°F (about 16°C), consider a slightly elevated or well-insulated bed. Look for low-maintenance beds that are large enough to allow for a six-inch (fifteen-centimetre) buffer around your pup. And feel free to buy a bed large enough for your pup once he’s full grown. Look for materials that can be washed regularly.
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Brad Pattison (Brad Pattison's Puppy Book: A Step-By-Step Guide to the First Year of Training)