Quarantine problem solved

You should vacuum more often. I do it yearly, whether it needs it or not, lol. Seriously though, dogs are like two year olds and who knows what they're thinking. I've had 7 in my life, most were cool with vacuums and a couple absolutely LOVED a vacuum being applied to their fur, but the last one just wants nothing to do with them. As far as he's concerned it's just a big noisy machine that gets pulled around the house for no, logical to a dog, reason.

My dog has taken to standing (or sometimes that playful bowing position) and barking right in front of the vacuum. Like dude move it’s gonna hit you and then you’ll be even more upset

Sounds more like a challenge than fear. I suggest attaching a drone, lol, to get him to back off. And thus we have come full circle. :)