It starts with an almost unconscious feeling that all is not right with the world.

It is a sense of impending doom that lasts for maybe a second or two.

Then it hits.

There is the gagging reflex, with a sense of nausea that is worse than the worst hangover.  The eyes stream and the throat feels raw.  Everything takes on a sickly green hue.  There is a strong urge to vomit which I resist as best I can.  The dizziness is the worst, as the blood drains from my head, leaving me feeling cold and clammy.

All I can do is sit tight and wait for it all to pass, which it eventually does after what seems like an age.

Jayzus, but that dog’s farts are lethal.