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					Originally Posted by Maximo  There are many YT members who have large dogs in the same home as their Yorkies.  However, Ladymom has been on YT long enough to read enough tragic stories of Yorkies being killed by their larger family members.  It is a risk.
 There was a story here not too long ago about one member who came home to a bloody, heartbreaking surprise.  Even if you supervise closely, attacks can happen too quickly for you to stop.
 
 The GSD needs professional training one way or the other.  I have owned large dogs, and I firmly believe they need highly qualified trainers.
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  I do agree; it is a risk.  For sure.  But I've always read a few stories of little dogs killing each other while no one was home as well, including 2 Yorkies.  I think it works (big dog/little dog combos) more than 
not work, but of course you're going to read on the internet more about the bad things than the good things, because that's generally why people come to the internet, when there is a problem, so when reading this forum, you will read more problems than good things in general, just because it's a place people seek medical and training advice.  I think you have to know your dog well (both little and large) and just be smart about things.  If the dogs don't live together 24/7, I wouldn't leave them alone unsupervised.  My grandma's large Lab is great with Jackson and he loves her, but because he's only been around her about 8-10 times or so, and never left alone with her, I wouldn't leave them alone unsupervised even though they've always 100% gotten along.  
 I believe that all dogs, large and small, need good training because, in all honesty, I meet alot more nice well behaved large dogs than small dogs, because their owners know the large dogs usually get blamed, lol.  A 100lb GSD that is lunging at the end of its leash barking at other dogs while on a walk is going to get a lot more grief and criticism than a 4lb yorkie doing the same thing, and I think both situations need to be handled the same. 
I totally think it's realistic for them to become friends, but you'd have to explain he mouthing and biting a little more.  Is it aggressive or playful? That makes a huge difference.  Also, my friends Yorkie, Nala, is on her back 90% of the time at the dog park, lol.  She loves everybody... it's just what she does.  She's just really submissive.  But she has a blast at the dog park (we go in small dog section) but she's still always on her back.  It's just the way she feels comfortable.  
BTW-- this is not directly aimed at you Maximo! I'm just posting this as a general statement for this thread, even though slightly O/T.