Hair loss is normal and natural for your Affenpinscher.Shedding the undercoat happens to most dogs in the spring and fall to allow their new hair growth. It's just part of how they stay healthy and beautiful. Affenpinschers shed their hair in different ways, depending on their coat type. Long-haired Affenpinschers might shed only once a year, while short-haired Affenpinschers may shed more frequently. Most of their hair will fall out naturally in its cycle.  The main reason for hair loss is the change in seasons. You may notice more hair loss during spring and fall since that's when they shed. Excessive shedding may also result from seasonal allergies or sensitivity to allergens in the environment.