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 flea of the toxicity of flea treatment products have been scientifically studied and are available online from the Natural Resources Defense Council. Dog flea The dog flea ("Ctenocephalides canis") is a species of flea that lives as an ectoparasite on a wide variety of mammals, particularly the domestic dog and cat. It closely resembles the cat flea, "Ctenocephalides felis", which can live on a wider range of animals and is generally more prevalent worldwide. The dog flea is troublesome because it can spread "Dipylidium caninum". Although they feed on the blood of dogs and cats, they sometimes bite humans. They can