David Nicholls wrote: I knew a woman who made a garment with her dog's fur, a jersey from memory.
Using the fur that's been brushed or trimmed from a dog is fairly common, although I don't know many people who've made larger items. There's a local lady who sells mostly hats and mittens. Her work is very creative, utilizing fur from different coloured dogs to create pattern and interest.
I do not doubt that humans would have made use of any skins that worked for identified needs. Apparently certain types of shark skin make very non-slip grips on tools, and I've heard of snake skin boots.
Unfortunately, in modern society with artificially made materials abundant, some groups have perceived harvesting of natural materials as cruel and unnecessary. When done on an industrial level, both artificial and natural materials may be produced in ways that are damaging to nature. Places where a type of animal is identified predominantly as a "pet" there may be laws preventing the use regardless of whether the animal died naturally or not, so I would check carefully.