Do Dogs Go Through Shedding Stages?

A dog's genetic profile determines the length of his hair and hair growth cycle.
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Of course Barney is a unique dog, with his own winning personality and handsome looks. However, like all dogs, he sheds. The shedding cycle consists of four stages and is how your pooch loses old and damaged hair. The season, his health and breed impact how much and how often he'll shed.

Anagen and Catagen

Dogs shed in four different phases: anagen, catagen, telogen and exogen. Barney's hair grows the fastest during the anagen phase, the first phase of new hair growth. His genetic makeup determines how long his hair follicles remain in this phase. The catagen, or transition, phase is when his follicles receive a signal to stop creating new growth.

Telogen and Exogen

The telogen, or rest, phase is a time of no new growth and is followed by the exogen, or shedding, phase. As the name implies, when Barney's in the exogen stage, his hair begins falling out and his follicles begin transitioning back to the anagen phase.

Different Cycles, Same Stages

The shedding cycle is different for every dog and it's difficult to know exactly what controls it, though more is known about its influences. Some dogs may have very long anagen and catagen phases, where their hair grows and they don't shed much. High-shedding dogs tend to have much shorter anagen and catagen phases, lasting as little as a month, so they shed more frequently.

Seasonal Shedding

Barney's health and breed affect his hair growth cycle, but the season influences his shedding stages, too. As spring approaches and the day grows longer, he'll grow more hair. You may notice when he sheds his coat in the spring there's more hair floating around; that's because his winter goat is being weeded out for a lighter summer coat to come. Depending on his growth cycle, it can take as little as three weeks to as long as two months for his coat to be replaced. If Barney's a dog with a double coat, such as a Siberian husky, he'll probably drop his undercoat twice a year and lose his topcoat once a year. Some dogs, particularly those those living mostly indoors, shed throughout the year, while others may shed only once a year.