Did you know? Dogs do not have collarbone, at least not to the extent humans do. The reason for this is that, humans, as dexterous beings, depend on their clavicles in order to swing their arms.
In the olden times, our ancestors likely have used their arms to swing through one branch of a tree to another, a form of locomotion known as brachiation. Although, we no longer live in a jungle, we still use swinging motions to throw rocks or play a game of golf.
In any case, dogs have little use for clavicles, so they are equipped with only a rudimentary clavicle which measures less than an inch long.