This free pattern over at Lion Brand Yard (you have to sign up for a free membership to access it) is called a Felted Witch’s Hat, but you actually crochet it first. Then you wash it and using a felting technique to turn it into felt, which makes sense since you use wool yarn to crochet it first. They also have a note on the pattern that you could make a super small sized hat for your pet. Of course, my dogs would eat this, but if you have a little dog that wouldn’t rip it to shreds and are looking for an adorable costume idea, this might do the trick.