>>Another issue, the 2 dogs are playing roughly all the time unless they are separated and we are unsure if this will continue or if it just an adjustment period?
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This breed is high-powered and not body-sensitive. There's a big size difference between the dogs at this point, and they are getting to know each other. The younger dog is going to keep changing rapidly for quite some time, so the getting to know each other will have to continue. You should plan on continuing to supervise their interactions for quite some time.
They should not be alone together until the pup is somewhere between 4 and 7 months of age, and it might take longer. That's not as big an issue as you might think, since housetraining and prevention of destructive chewing habits will call for crating her when you can't supervise her until past that age anyway.
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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