Origin of the domestic dog matched across Eurasia and its branch is phylogenetically rooted in the same sequence as the Altai dog (not a direct ancestor). The subclade d2 hybrid haplotypes are found in 2.6% of South-West Asian dogs. Haplogroup E: Derived from post-domestication wolf–dog hybridization in East Asia, (rare distribution in South-East Asia, Korea and Japan). Haplogroup F: Derived from post-domestication wolf–dog hybridization in Japan. A study of 600 dog specimens found only one dog whose sequence indicated hybridization with the extinct Japanese wolf. It is not known whether this hybridization was the result of humans selecting for phenotypic traits from local wolf populations
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