[Draco]

Draco has this habit of demanding the attention of others by barking when we're out in public. I'm not sure how to correct it. Leaving the store or place every time isn't always possible. It's usually at checkout line, when people start to notice him and give him attention from afar. He gets really excited, meeting them/bringing them over doesn't help. And not allowing them to come over doesn't either.
At home he never really barks unless it's to alert me of mailman/delivery guy which honestly I'm grateful for since I never seem to hear them arrive. So it's kinda of hard to mark the barking when we're on our own.

This problem in the past didn't bother me much, because I rarely took him to stores. But I've been dating someone, and would like to bring Draco along on outings because most the places we go are quite dog friendly. This behavior makes it difficult.

How would I correct this behavior in public? Do you think a class would actually work or personal training? Has anyone already been through this and have tips to offer?

Teaching him commands, like to sit, lay down, come was all easy and pretty much depended on my own consistency but he picked it up quickly and it doing just as well since I've started practicing more.