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  It is a beautiful dog.  Could you hire a trainer to come to your house to help them all get adjusted?  He can learn to play well with them in time, despite the difference in size (my 70 pound golden and 15 pound doxie were the best of buddies while she was alive). Bringing a new dog in (no matter what the size) always results in some growing pains. 
 I wish you luck.
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