If human beings use their sense of sight as the main sense to asses the surroundings, the sense of smell is the one dogs use to familiarize themselves with their environment. The olfactory system is the main sense and it is extremely sensitive and efficient. Dogs use almost 30% of their brain to analyze scents and it is 40times larger than humans.
Based on recent studies, a dog's nose is so amazing that it can sniff cancer into the human body and can detect body heat. As if it was not amazing enough, they can also remember things that have happened in the past with just a few sniffs.
The structure of the dog's nose is the secret to its amazing ability to detect, and understand, smells. They have two nostrils that can separate their smelling and breathing ability effortlessly.
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