I have not. I don't know if our local vets treat chickens. If any do, I'd like to have one treat Rojo for his chronic bumblefoot, which I have given up on treating, since it's clean and dry and does not seem to bother him. I'd love for him to have an antibiotic shot for it. Other than that, no. I treat my chickens as advised by the Educators here on BYC.