Don’t even try to hide treats from your dog. His nose knows you have them. Just don’t let him get his paws on any foods dogs can’t eat. Dogs’ sense of smell is 10,000 to 100,000 times more sensitive than that of humans. Just how powerful is that? As James Walker, former director of the Sensory Research Institute at Florida State University, told PBS, “If you make the analogy to vision, what you and I can see at a third of a mile, a dog could see more than 3,000 miles away and still see as well.” These are signs that your dog is mad at you.