Reddit mentions of Ancol Ergo Pin Brush Dog

To add onto the advice you've already got with info from my breeder:

• When they're shedding their puppy coat (which at 12 weeks, yours will have started to do) brush daily with 2 different types of brush (first one like this then a pin brush like this, making sure that the pin brush is only pins with no bobbly bits on the end). If you don't brush enough as a puppy it can stop their adult coat growing in well, and only going in weekly will leave you with a lot of knots, tangles, and possible matting. Once their adult coat has grown in, our breeder told us that we could go down to brushing 2/3x a week.
  
• Avoid using perfumed products often (e.g. leave in conditioner, brushing spray, or too much product when washing every 2-4 months) because, while they smell great to us, other dogs may not like them. It's also unnecessary because keeshonds aren't a very smelly breed, and grooming while wet can pull out fur that isn't ready to come out yet. Dry them with a hair dryer on a cool setting (have lots of treats on hand because the noise is not something they like at first) and go in with the pin brush on the bits you've just dried.
  
• This is the most helpful source I've found online for grooming. It has a lot of info and pictures of the brushes you should be using, and step by step instructions for bathing! It also has info about nail clipping/trimming
  
  Also, I just want to say that is the fluffiest keeshond puppy I've ever seen. He's adorable!