Because Dogs Will Be Dogs !!
It is important to groom your dog and visit a professional on a regular basis
A clean, well groomed coat is less likely to harbour fleas and ticks from the great outdoors and their furry friends; during the process other infections and irritations can be picked up.
Brushing in a relaxed, unrushed manner is good for a dog's circulation, coat health and general wellbeing. If this is introduced as a puppy it becomes an accepted part of it's socialisation, and a welcome activity.
Brush between grooms to prevent matting. If a dog is very matted it may need a close clip in order to remove the coat to a very short level.