Dog shedding : why and how to reduce it?

All dogs shed to some extent and there’s no such thing as a totally hypoallergenic dog breeds. Unfortunately. It's a normal process they have to go through to keep their coat and skin healthy, however it's annoying for us. But do all dogs shed the same amount? How do you know if your dog is shedding excessively, and what can you do to keep vacuuming to a minimum (or at least reduced to just once per day).