The dog has been selectively bred over millennia for various behaviors, sensory capabilities, and Over millennia, the dog has been selectively selected for a variety of behaviors, sensory capacities, and morphological characteristics. Dog breeds come in a vast range of shapes, sizes, and colors. Hunting, herding, pulling cargo, protection, supporting police and the military, friendship, therapy, and assisting disabled people are just few of the functions they play for humans. Because of their impact on human culture, they have earned the moniker “man’s best friend.”