types of shepherds

Question
My question is My shepherd had a straight back, walked tall, and some shepherds slink at the hind hips. Is there a true name for this kind??  I just lost her and want to get the same kind.  

Answer
I think I know what you are talking about.  I think there is a name for the ones with the sloping back, but I don't remember it.  I find the straighter back ones more attractive too.  Try www.akc.org.  They may discuss it, or have a link to a group that does.