Dog sniffing skill comes to them, even when they are newborn. A newborn dog can sniff his mother with his nose when their eyes have not opened yet. You can start dog scent training with some fun games like finding the treat or catching the tennis ball. If you are training hunting dogs then you can use bird dummies. The essential oil also plays a vital role, apply some essential oil on any of your dog’s favorite toys and hide that somewhere in the home. Your dog will find that out with the help of essential oil odor.