I no longer bring my dogs right up to a door with me when I go ANYWHERE. I leave them in the car initially and then take them out afterwards.
I went to my friend's house with Wally for the weekend. She knew we were coming, invited Wally, etc etc. I rang the doorbell, she opened the door, and her motherfucking Boston Fucking-Idiotic-Terrier ran out the open door and latched herself onto my poor big boy's face!!! She just stood there while I had to mandhandle her dog, who wasn't wearing a collar, to get the smurfing douche off of Wally.
Since then I no longer bring my dogs to the door (wow, that was 4-ish years ago now), but truthfully beforehand it had never occurred to me NOT to bring them up to a door with me
Then again I'm not a door to door salesman . . .
"All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another." -Anatole France