Origin of the domestic dog as the Tibetan people. A population genetic analysis then showed a significant convergence between humans and dogs in Tibet. Like the Tibetan people, Tibetan mastiffs appear to have derived these benefits partially from the EPAS1 gene, acquired through introgression. In 2015, a study found that when dogs and their owners interact, extended eye contact (mutual gaze) increases oxytocin levels in both the dog and its owner. As oxytocin is known for its role in maternal bonding, it is considered likely that this effect has supported the coevolution of human-dog bonding. One observer has stated, "The dog could have arisen only
Dog anatomy of Fibula Metatarsals: Talus, Calcaneus, Trochlear Ridges, Central Tarsal Bone, First, Second, and Third Tarsal Bones Vertebra Body, Pedicles, Laminae, Spinous Process, Transverse Process (Wings), Articular Process, Vertebral Foramen, Intervertebral Foramina, Atlas (C1), Axis (C2), dens, Ventral Lamina (on C6) Pelvis: Acetabulum, Ilium, Ischium, Pubis Skull In 1986, a study of skull morphology found that the domestic dog is morphologically distinct from all other canids except the wolf-like canids. "The difference in size and proportion between some breeds are as great as those between any wild genera, but all dogs are clearly members of the same species." In 2010, a