Dog sleep when nothing is going on to arouse them, usually somewhere between 14 and 18 hours total sleep out of every 24 hours. Ideally, you want the dog to be able to sleep while you are gone. Sounds like it's working great!
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47


