Origin of the domestic dog that was the most divergent group. The study found that the skulls of the "Goyet dog" and the "Altai dog" had some dog-like characteristics and proposed that the may have represented an aborted domestication episode. If so, there may have been originally more than one ancient domestication event for dogs as there was for domestic pigs. One theory is that domestication occurred during one of the five cold Heinrich events that occurred after the arrival of humans in West Europe 37 000, 29 000, 23 000, 16 500 and 12 000 YBP. The theory is that the extreme cold during
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