Origin of the domestic dog or the result of natural introgression as the dog expanded across Eurasia. In 2018, a study found a small amount of dog ancestry in 62% of Eurasian wolf specimens looked at, that hybridization had occurred across a wide number of timescales and not just recently, however in contrast there was almost no admixture detected in the North American specimens. There was introgression of the male dog into the wolf, but also one hybrid detected which was the result of a male wolf crossed with a female dog. Wolves have maintained their phenotype differences from the dog, which indicates low-frequency hybridization.
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