#3 Grooming him you can track down out fleas and ticks. They are disgusting and can make your dog very uncomfortable, causing itchiness. When they are not treated in time can be dangerous to the dogs health transmitting disease to him.
#4 It gives you the chance to notice early any signs of dull, dandruff and hair loss. All these can be signs that he has a nutrient imbalance or a thyroid condition.