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					Originally Posted by SirTeddykins  I agree its probably fear but consider also not forcing your dog to try to get along with the bigger dog.  There's no reason your dog has to be best friends with every dog it meets!  My Teddy is exactly the same and the vet advised that the stress he feels in trying to get along with someone/thing when he's frightened just isn't worth it...  They either come around or they don't.
 Just a second opinion!
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 Great advice.  I agree, the little one is afraid, as well he should be.  He is using all his power to seem bigger and tough, but that can also get him hurt.  Your first, and only responsibility is to keep your little guy safe, which means keeping him at a distance, even in a pen or crate if other big dogs are around.