McKenzie is 4 lbs and she sometimes sleeps with us. She typically curls up right between myself and my DH and doesn't move. I put a rolled up fleece blanket between her and my DH as he tends to roll over in the middle of the night.
She doesn't wander around the bed though, so she wouldnt take a tumble
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I've heard that some people put pillows or blankets around their bed just in case
