I was honest with the rescue, the dog I got from them was showing some aggressive mannerisms like wanting to chase with fur up on the back...other dogs, cats, rabbits & my chickens...as she was on a lead, actual physical contact was not possible. The rescue said due to that behavior they'd euthanize her if I returned her! So here I am 2 yrs later still looking for a good home for an adult mix breed, housebroken and crate trained, friendly with people but not other animals.
My chickens are in safe enclosures as I have foxes, raccoons & hawks in my yard daily, but I can never free range here again, which sucks. I wish I could afford to fence in my yard perimeter & do it properly to prevent digging under, as the dog does chase off predators, but I can never trust her to be with my flock. It really does depend upon the individual personality of the dog. For 14 yrs previously I had the most wonderful, gentle 130 lb Rottweiler, I raised as a pup, she'd even let Cockatiels land on her & preen her. I raised her calmly, hugged her alot, took her to classes so she'd still pay attention to me in the presence of other dogs. She was 1 in a zillion, how I miss her! The dog I rescued was already an adult, calm while at the rescue. Well yeah, she's still calm as long as she's in her crate! Outside of her crate she's a clumsy bull in a China shop & not trustworthy at all, in the house or outside. She only listens while on a leash. She's abt 7 yrs old & really good on leash, but I can't watch a dog 24/7 while doing chores, can't even have her out on 100 ft cable system unsupervised as she got sick eating fox crap. In the house,, in the same room on a dog bed with a bone, I can't even leave the room or she eats any trash basket contents. Unfortunately, she's not a good fit here & it's not easy trying to find a good home for a dog these days. Some dogs would just do best as the only pet with a fenced yard. Even raising a pup with birds is no guarantee they'd get along, but I think the odds would be better than trying an adult. I am not trying to discourage anyone from trying, many people have had good luck and good results, I just want to make you aware that not all adoption agencies will take a dog back once they hear there is any kind of aggressive behaviour, even though an actual attack or fight never took place. It has been a real pain in the wazoo, trying to do the juggling act here for 2 years now. It's an extra hour or 2 of time every day that I really can't afford to spare, going back-and-forth spending every moment with this dog while she is outside, but she needs her exercise so that is what I have to do. Many rescues will let you do a meet and greet ahead of time but usually that involves cats or dogs, not chickens, and if you are going to bring a chicken to rescue with a 100 other barking dogs it's going to be very difficult anyway, if they even let you bring a chicken. I know I wanted to give an adult dog a good home, it is a very good idea to rescue a dog that's already out there needing a loving home, but going forward, I'd get a pup like I did before, as well stick with a breed that I am extremely familiar with, a gentle giant breed. I haven't read through all of the numerous posts here so I hope I'm not repeating, nor do I wish to insult anyone, just sharing what I've gone through. Best of luck to you with whatever you decide.