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Raccoons reproduce fast, so it is pretty sustainable.

Shoot... If the main criteria for a good brush is that it comes from a mean critter, my ex-wife could make a fortune selling her hair.

Dang! Those are good prices for gophers. I trapped gophers for bounties for a few years as well, but they didn't pay that good.
I used to have a dog that would sniff out the tunnel and dig it out...

There are programs where the badgers are told that they are donating their hair to other badgers that have lost hair due to illnesses, for the purpose of making badger wigs.
Then we actually use it...