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.
Mites of domestic animals reaction in the host, but pruritus, seborrhea and pustules in the skin may develop as an allergic reaction to the mites. The adult mites are visible crawling in the fur and may cause similar skin reactions in the pet's owner. Other genera of mites that cause similar problems in colonies of rodents are "Myobia" and "Myocoptes". The genus "Megninia" has species found on the feathers of poultry birds. Compared to ticks and insects of domestic animals the parasitic mites are of limited importance as transmitters (vectors) of pathogenic organisms to domestic animals. Some mites are the intermediate host of parasitic