Here are some links.
https://www.backyardchickens.com/t/509043/how-do-i-introduce-my-dogs-to-my-chickens-chicks
https://www.backyardchickens.com/t/633767/is-introducing-my-dog-to-my-chickens-ever-a-good-idea
https://www.backyardchickens.com/t/709323/introducing-my-dogs-to-my-chicks