I know of a couple of rare breeds...

One is the Dogue de Bordeaux. Its not that rare but I love it. It is better known as the French Mastiff. You may have seen one in the movie Turner & Hooch (he plays hooch).
I also like Carolina Dogs (American dingoes). They are neat. Ever heard of the Polish Lowland Sheepdog? They are a herding breed (mainly to protect stock) and they kind of look like benji but mainly grey and white.

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*Get a Grip Get an Aussie*