My dog uses pillows to sleep all the time and when a pillow is not available he keeps his hand under his chin to sleep just like we do. So the head shape and spinal curvature lends to using a pillow as a good support to feel less tense and comfortable. Try sleeping flat on the floor or sideways, your neck will fall off to one side and you will need to tuck your hand in under your head to keep your spine in a neutral position.
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