Don't do it. If your goal is for the dog to interact with your chickens, then unless that dog is an LGD breed, it's not safe enough. Any dog (again, unless it's an LGD) will chase a chicken if given the chance. I would advise you against doodles in general. Now, if you just want a pup, go for it, but do not let it interact with your chickens without a fencing in between them. So, if you're looking for just a pet dog, find a breed whose temperament and energy requirements fit in your lifestyle, and get it from an ethical breeder. Or, you could go with a rescue dog as well. But again, if your dog is not an LGD it should not be left with prey animals (chickens in this case) unsupervised. And even an LGD needs the appropriate training