DDog can't wait quietly outside a shop

[BlackSwan]

Every time I leave my dog outside our local shop for 3-5 minutes to buy a bottle of milk etc, he barks incessantly. He can even see me while he's barking, it doesn't matter... he knows where I am, he just doesn't like being left for any period. He's fine to be left at home.
I really wish he would chill. What should I do? I was thinking of giving him a chewy treat next time...
Anyone have this issue?

[Ihaventgottimeforthis]

My DM used to leave me in my pram outside shops when she went in with my older DSis. One time she forgot I had been born, and went home without me.
We still joke that we originally had a third sibling...
Some regulars to my local corner shop still leave their dogs tied up outside, it makes me uncomfortable for them.
One daily visitor isn't even tied up - he just sits next to the wall with a regally bored look on his face and rolls his eyes at anyone approaching until his elderly gent owner comes out then they amble off home. It's a nice throwback to days gone by and I cross my fingers nothing ever goes wrong.

[AmICrazyorWhat2]

I used to try leaving my dog by the side door of our local coffee shop as I'd seen other dog owners do it when they nipped in to get a drink. It's well hidden from passersby.

My dog wasn't having it, he'd be barking as soon as I went inside. Luckily the owners know me and are very nice, so now I sprint to the counter, leave the money (I always have the same drink) and go back to my dog. They hand my coffee out of the side door.

I also hadn't considered dog theft as people do leave their dogs outside more here. I wouldn't leave him anyway, he really doesn't like it.