I'd say it depends on the individual dog. Temperaments can vary so widely that it is hard to say what a dog will do. I have two younger dogs, my boxer is going on three and her puppy is less than a year and they are both fine with the chickidees. Our older dog who is better than ten has to be watched very closely. My boxer is very prey driven, but she steers clear of the chickens. I believe it is because I am her person and she knows the chickens are my loves. I think that if she sensed that I didn't like my chickens, they'd be fair game for her.
You know your dogs. Go with your gut.
You know your dogs. Go with your gut.