While everyone (including ourselves) advertises their Mylar weed bags as “smell proof,” there’s always a chance that trained dogs will catch a whiff of the goods within. The most common reason this happens isn’t because the bag is porous - rather, it’s often because the packagers were handling the flower and the bags as they filled each one. Their hands transfer cannabis oils/particles onto the outside of the bag, which any dog would be able to smell. To be extra cautious, wipe your weed bags down with a wet wipe.