This thought occured to me today. I used to have two Siberian Huskies. I saved some of the undercoat that they shed every year thinking that I would make something out of it. The undercoat is very fluffy and would not make a good shaving brush. But there are always a few of the stiffer guard hairs mixed in. So I was wondering if anyone had ever made a dog hair shaving brush. If so, how many individual hairs would be needed?