Hair is keratin, a protein, and could be a good addition to a compost pile. Just because of the extras I would not use hair from a source where it has beed bleached, dyed, and sprayed with hair spray.
When I did compost human hair I tryed to be sure not too much was added at any one time and mixed what I did add in well. I never saw anthing to indicate hair was harder for the bacteria in a compost pile to digest then anything else.

Hair is high in nitrogen and that includes animal hair. With four big dogs, I have plenty of dog hair and I use it.

I have heard that hair can be composted, but I collected some angora rabbit manure with their hair in it a couple of years ago, and I'm still finding the hair in the compost and the soil.

OMG! Maybe it's GROWING in there!

Sue