Another one here with rescues who have never peed indoors, so l agree with GSM. My latest was originally from Romania, in the shelter for at least 8 years and in the 4 months l have had him not one single accident indoors.
I am a huge dog lover but there is no need to take dogs into shops, supermarkets or indoor restaurants. The only exception being guide dogs of course. I never realised that supermarkets would allow dogs on their premises, maybe the employee was star struck by Russell Brand. Shouldn't have been allowed though.