I've only had the opportunity do food shops way away from home and a Chihuahua as my copilot.
Shooting a picture in the car was the only option.
This is what I did. I found some place where I could tie up the dog or let him run. If I didn't; he would've eaten my meal.
Then I took multiple pictures from every single angle I could imagine, while trying to keep an eye on my favorite brat of all time.
I will admit, my strategy was hit or miss. I did always end up with accepted pictures and not a squished dog.
I might add...it made sure the dog didn't eat my POV.
YMMV
Live your life in such a way that when your feet hit the floor in the morning; the devil shudders...And yells OH #%*+! SHE'S AWAKE!
Previously blocked poster using new name. Post removed