Did you know? The sleep phase during which young puppies twitch, kick and appear to be dreaming is called "activated sleep."

All that twitching has a purpose: it exercises those developing muscles and helps increase muscle tone so the puppy's legs gain sufficient strength and he can stand, explain veterinarians Liz Palika and Debra Eldredge in the book "Your Yorkshire Terrier Puppy Month-by-Month."

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