I know it's a bit different, but a pet supply store not allowing dogs is like a baby/kid store not allowing kids! To me it's like they're saying,"Come and buy stuff for your pup, but that same pup is not welcome here."
Not a place I would shop.
__________________  Shannon & Puff 
"All his life he tried to be a good person. Many times, however, he failed; for after all he was only human. He wasn't a dog." Charles M. Schultz |