My working line shepherd is 7 months old now and sheds a lot. I use a Kong zoom groom and a pin brush everyday which seems to get out a good amount of hair. I also have a slicker brush around but I don’t use it yet because I don’t wanna be too harsh on his coat while he’s still growing. At what age could I begin using the slicker and when can I buy a undercoat rake to really stop the shedding? Also what’s a recommended routine for brushing which brushes should I use and how often? Thanks in advance.