A lot comes into play here as I see it. First I noticed you have a pointer which is a bird dog, used for hunting, second are the dogs trained and listen to you. My dogs do not bother the chickens, goats ,pigs , horses or rabbits. Here is what I would do assuming your dogs listen to you. Introduce the dogs to the chickens,if they seem excited tell them easy if they stay excited and NOT focused on what your doing you need to keep them secured at all times. It is a process, do this several times a day until they accept the chicks, as they feather the dogs should have come to accept them.
Here at back to basics we have 3 dogs and just ready to pick up another one on thurs afternoon. That is what I do here, when we go out to check the animals or do chores the dogs are usually right under foot, if I see any aggression toward any of the livestock they are scolded, and I keep up the introduction and be easy with them. Now and again we'll get a stray dog that will come and chase the chickens and goats,but the other dogs keep and eye out and lets me know what is going on. It's always better to start as a puppy,but here you have to take the time and train. It will take time. Great looking dogs!! My son has a pointer a boxer and a jack russel and none of them bother his chickens either. Just be patient. Your invited to check out my site at any time.