Research Tip: You can start with the Saints and Animals unit at the UnTextbook, which is based on this book: Book of Saints and Friendly Beasts by Abbie Farwell Brown, and there is another book you might want to look at: Legends of Saints and Birds by Agnes A. Hilton.
You can also find articles at Wikipedia about the saints who have a special animal association: Saint Francis, Saint Giles, Saint Mungo, Saint Prisca, and more.
