I have been told that there is a german shepherd minature is there such a thing?

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If you mean are there any GSD's purposely bred to be miniature, like some of the 'teacup' varieties out there, then no, there isn't.
There are however, GSD's that sadly suffer with a condition called Pituitary Dwarfism :
http://www.gsdhelpline.com/dwarf2.htm