Please read the above link. “Cats and Dogs are predators: Birds are Prey”
Dogs (and cats) should never have access to birds. Many dogs have a high prey drive. All young puppies will want to play with things that move. Even the people who don’t think this applies in their situation with their seemingly low prey drive dogs, remember even they could easily ‘accidentally’ hurt or kill a bird. For this reason, we always advise members to not mix species. Be responsible for separating them.