hey true, i could be off, i've certainly never done any experiments about it =P
but this is my understanding, based on whatever info sticks after decades of growing stuffs and reading - most people dont compost hair, bones, animal parts because they take much longer to break down than veggies, leaves branches, etc.
if they do compost them, they compost them in a long term compost, not intended to be used for years. fur and hair will eventually break down, but as i remember it from where ever i read it long ago not for like 5 years or so....
well thats still my story and i am sticking with it, take it or leave it =)
theres nothing bad about putting hair in compost if you want, it just doesnt break down very fast. <---- in my understanding
i do lazy cold passive composting, or actually more lately i just bury half fisnished compost ish stuff, with deep mulch, under or within lasagna type gardens.... so i want stuff that compost fairly fast.
a small amount of hair wont matter much, anyway.
i shed quite a bit and have really long curly thick hair. i just throw mine outside anywhere on the ground, for the birds to find. =)
Probably depends on quantity and the animal. I've also composted small animals and no trace has been left (not even bones). That's cold composting that I might use after 6 months. I'd do that with lasagne beds too and wouldn't be too worried about it. Compost is magic, so ymmv.
Composting is EPA approved way to dispose of animal carcasses. I have never had to compost a full grown goat I have several kids. Last one was a sick kid I took home to try to save. I failed. I put kid where I plan to plant something and I dump cart of compost mix on top and I walk away. Later I till plant a tree or vine. Great.
But on hair...I love barn scrapings during shedding season!
We have dogs that shed so much it looks like something died in the yard whenever I comb them out on the lawn. I just toss the stuff around the garden or wherever I happen to be. Who cares if it actually composts? It makes great texture for the soil and what doesn't get integrated is always useful to the birds for nests, as Leila pointed out. And it keeps the titmice from landing on my head and yanking whole handfuls of my very long hair out -- which they do whenever I sit in the garden too long during nesting season. Seriously, it would be hilarious except it hurts!