Yesterday at my knitting group, one of the gals, Lynda, had a bag of her Golden-doodle's matted undercoat fur with her. I don't remember why she brought it out to show us but as soon as I saw it I asked her if she would like to see what it looked like spun up. I was intrigued.
I gave it a wash to set the twist, let it dry and used my 36" nitty noddy to wind it into a skein. Now it's ready to be knit! I think it would take dye really nicely. you can't tell from the white background but there's a very light halo to the yarn.
Lynda has 4 dogs, I'm sure she has lots of their undercoat matts that could be processed. I wonder if she would like more yarn made? I guess I'll find out next Wednesday at my knitting group