Thin dog hair has a diameter of about 75 microns in diameter may be coarser than 200 microns. Healthy hair depends on the balance of animal food: proteins (and particularly are rich in sulfur amino acids as cystine, and tyrosine and methionine), essential fatty acids, copper and B vitamins have an adult dog 30% protein consumed per day may be used to update the skin and coat. Hair growth are also influenced by hormonal factors: thyroid and growth hormone stimulate the activity of hair follicles, whereas corticoids and sex hormones to slow down. Once in the blood levels of prolactin (a hormone produced in lactating females), hair looks like in the summer – pretty thin and sparse. Lin all dogs of different breeds and individual dogs of one breed lost and re-invigorate hair at different speeds. Dogs living in premises that are rarely exposed to natural light and low temperatures, tend to lose hair more or less permanently. Conversely, dogs living outside the home, exposed to natural lighting and low temperatures, often lose their hair within a few weeks in spring and autumn.
In autumn they get rid of his short, light cover, and they grow a thick, warm undercoat and a long protective coat able to withstand bad weather. Since dogs are preparing for winter. In the spring of a dog loses a winter cover to provide an opportunity to grow a new, shorter and easily; mu. In this case, changing the appearance and structure of the wool, but the general number of hair follicles and remains unchanged.