Scent control, and I like to use this example: When a human smells chili cooking they smell chili. When a dog smells chili cooking they smell the beans, corn, individual spices etc. Which is why they are so good at busting drug traffickers who try and 'mask the scent' of narcotics. A deer's nose is about 1/3 BETTER then a dogs. How can these spray bottles of scent control fool that nose? I don't think they can. If someone sprayed a steak with this scent control, put the steak on the ground and let their dog go, how confident are you that steak would be left untouched?