Once we figured out what he was up to, I'd keep an eye on him so I could go pick him up and lay him inside on the cool tile next to his water bowl when he was done for the day.
You're saying that your greyhound wasn't just getting drunk, but actually making his own booze? Not that I don't believe that its possible, but that's a pretty big deal... If you had documented that it could be a bombshell ethology paper.
Seems the author has found the forbidden fruit as well!
One summer, walking around a large quay/wharf, lying fallow after being flattened and then raised, exploring how so called 'pioneer plants', grasses, flowers, trees took hold there, I noticed the strong smell of ripe blackberries from afar.
Found the few dozen bushes, surrounded by swarms of insects of all sorts, really darkening the air.
Stepped very slowly and carefully right into it, plucked my share from the upper parts of the bushes without being stung or them crawling on me.
Squatted down to take a closer look. Many overripe berries lying on the ground. Insects coming down in spirals like the finger of a tornado, but slowly. Big buzz and hum in the air. Feasting on the mushy berries on the ground. Flying out really low, just a few centimeters off ground, erratically as you described.
Amusing indeed! :-)
Edit: Detailing the most amusing things from memory:
Bumblebees swaying sideways and actually bumping into dandelions(which they are feeding on too, in more normal times), softly crashing into the ground, sometimes on their backs, only to jittery take off back into the air, slowly swaying away further for the next leg of a few meters, only to bump/crash again, and so on, until out of my sight. Other insects too, but with the bumblebees it was most noticable :-)