I take my German Shepherd just about everywhere with me but not into the stores although I did think about putting on a pair of shades and fitting him with a harness.

Thought I could get away pretending he is a guide dog but I think him jumping all over the place and me perving on ladies in tight clothing might give us away.
Seriously though, I do take him a lot of places but he is more than happy to sit tied up out side and wait for me to do my shopping. He also makes a lot of friends that way too.
I do understand that "Service dogs" are important to their owners and all that but I really think that a lot of people are rorting the system and just taking their everyday pet into places they shouldn't be. Also I believe sticking a dog in a purse should be a criminal offense. I know if I stuffed a puppy into a box I would probably be hauled away by the police for animal cruelty(not that I would anyway).