I think there are lots of weeds that smell of skunk. Some more than others. I would bet if a dog was trained to sniff out the slightest skunk smell it could find any bag of weed wherever you hid it no matter if you thought it smelled of or contained any skunk.
I also think that actual skunk spray will overpower any room of the stinkiest "skunk" plants and is not as pleasant as weed skunk. Actual skunk spray can make people vomit. LOL!
Dogs are trained to smell a terpene that is in pretty much all pot. I believe its Caryophyllene.
Skunk thiols are just in very skunky stuff. Dogs would miss most strains trained to sniff out skunky thiols only.