I have heard that cat hair can felt as you look at it, but the undercoat from my longhairs is sooo soft. I am blending malemute, mohair and Romney (as a binder) at the moment - with a sprinkling of cat hair as my fibre-loving felines roll in the dog hair. The Malemute is very soft, with long soft guard hairs that I am leaving in and making a feature of the yarn (its not for a garment) to match the long black guard hairs from the cat. I am at the carding/blending stage, using old mismatched carders as I don't think it would be very easy to clean my drum carder, and as I go, the dog hair is vanishing into the mohair and it feels wonderful! I haven't attempted to wash or dye the dog hair in case it felts but I am hoping that when I dye the finished yarn, the different fibres will take up colour at a different rate and give me a heathery look to it.