None of this shit is a sure thing against dogs, but it's certainly better than nothing. Vacuum sealing is the best option by far. Even that is not 100% safe but if you do 3 layers with vaseline between the second and third, it's damn good from what I've heard. That's the only way I would ever send a package of it or try to put it past the dogs. And the fresher it's been sealed, the better (since air still slowly gets through). What school has this much crazy shit though?? And why don't you just not bring weed? That sounds so dangerous...