From the perspective of the store owner, it is probably a liability to have a dog in the store. It doesn't surprise me that they would say no to a big GSD vs. a smaller dog. I don't agree with it, but generally a small dog would be less of a 'threat'. I think we all have a pretty good handle on our GSDs, but some people are, well, not equipped to handle large animals, and I can see why bigger dogs would be discriminated against- especially the ones with a bad reputation.
Jackson- DDR/WGSL 5/5/10
Tinah vom Gildaf- DDR 4/29/13