In dog scent training you trained your pooch how to use their nose. Dogs have a more evolved sense of smell than humans, they have more millions of scent receptors.  Filthy Smell: As we all know that dogs are wild animals and also they are hunters. So, they attract filthy smells the most like feces, rotten plants, and dead animals. Food: No dog can resist the smell of food, especially when you are talking about – meat. Whether you are grilling beef or opening a can of dog food. Familiar Odor: Dogs prefer familiar smell; smell they know and can trust. The smell of family member socks or shoes.