WTF?!?! you have virtually no chance of actually fooling a trained sniffer dog.. Their noses detect nearly everything.. They aren't all trained to trigger on all scents however, and dogs are dogs, so sometimes they get confused I guess..
I remember when I was in HS, the hallways were 'packed' right after the bell, and there was a narcotics dog being led through the crowd.. I had a stinky ass small bag in my pocket (I kept smelling it too strongly for comfort through 1st class), and by the time I saw the cops/dog I couldn't avoid them without looking really suspicious.. The dog's face actually brushed its face all along that pocket (like I said, really dense crowd), but it didn't alert..