Outside Francesca's Cafe
Here's a list of stores, shops, and cafes in the South End that allow dogs inside:
Francesca's Cafe ~ This great cafe on Tremont Street (at Clarendon Street) allows dogs inside on leash to order food to go with their owners. There are also benches outside to eat and places to tie your dog outside, as well.
Design Within Reach on Tremont St.
Design Within Reach ~ This furniture store on Tremont Street between Berkeley and Clarendon allows dogs inside while you shop and even has some dog treats at the front counter.