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
Ticks of domestic animals classification of the Acari, including the two families of ticks of importance to domestic animals is in the article Mites of livestock. "Amblyomma" species are widespread on domestic animals throughout tropical and subtropical regions. Typical "Amblyomma" species are: "Amblyomma americanum", the lone star tick of southern and eastern USA; "Am. cajennense", the Cayenne tick of South America and southern USA; "Amblyomma variegatum", the bont tick of Africa and the Caribbean (see Gallery below for photograph of female and male). A typical "Rhipicephalus" species is "Rhipicephalus sanguineus", the tropical dog tick, specialized to feed only on dogs. It is distributed globally