Tame them by getting their eggs. Use a whip while you're grappled to a flyer. They need five fireplaces to hatch. It doesn't take that long for them to grow, but to hatch them it's thirty minutes. They can be found easily on the white cliffs along with their eggs. I don't care if you like this or not I just wanna give tips.
This might be an unpopular thing but I’ve always used the fluffy chickens to do the boss fight on Valguero. They are insane at taking down the dragon and makes it a really easy fight. Simply stand back and watch while they do the work