Definitely get this pup going on the rest of it's shots. Parvo is an ugly thing for a pup to come down with.
As far as raising it to be good around your chickens? If you want to turn out a good ranch dog you've got about 2 years or more of constant training to do with this dog. That is how long larger dogs are considered pups, it's time well spent. I raise and train my own ranch dogs from the time they are 8 weeks old. I do two things: First, I keep the pups under my control at all times, either on a leash or in their yard. They are NEVER allowed to be loose or unsupervised around the chickens. That is simply expecting way more then a pup can handle and an epic FAIL can be expected. I don't ever want them chasing or catching birds, that just sets back your training that much more. During this time they are also learning all their basic obedience commands, come, sit, stay etc.
Second, I take pup with me, on a leash, for barn chores and any other time I'm working outside. Pup goes right in with the chickens with me, on the leash, and I use that time to discourage bad behavior. Calm behavior and ignoring chickens is highly praised. This goes on day after day after day. And then some more. Eventually dog gets over the excitement, chickens become not only boring, every day stuff, but dog knows they belong to ME and are not to be messed with.
Some dogs are easier to train then others. Not all dogs can be trained to be trustworthy around chickens, I don't care what anybody says, there are some dogs that just can never be trusted, they don't have the temperament. You just have to see how your dog does as it matures but you must give it the benefit of consistent training right from the start.