The most common dog sleeping position is the Side Sleeper, which is when a dog sleeps on its side with its 4 legs extended. Medium sized to larger dog breeds tend to sleep in this position. Dogs who sleep in this position are usually relaxed, comfortable, and trust their surroundings.
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“The most common posture that dogs use to sleep is lying on their sides with their legs extended,” says Dr. Coren. This means that a dog is relaxed and comfortable and shows a level of trust with his surroundings.