Hair loss can be due to a number of reasons, which include inadequate kennel ventilation or persistent increase in environmental temperature.This causes the pet to shed fur as an adaptation for more air to reach the skin. This also explains why you may notice excess shedding of hair during hot weather.
The cure will depend on the cause. Personally, I have noticed that dogs kept in well-ventilated kennels shed their fur minimally.
Clean their bodies always using prescribed natural detergents.