Good for you Molinda. What you want to do is get him to ignore the chickens whether you're out there or not. Sounds like you're on the right path.
How to stop the family dog from chasing my chickens? - Page 4
Hi! I have the same problem with my standard poodle Ruby. The only way stop this is by not letting your dog go near the chickens or see them. Most people see this when their dogs have tasted blood. And the fact is you need stop it as soon as possible or you will start to realize that your dog is not fully trained. Stop your dog from chasing your bantems first or it be harder to stop later. I hope this is helpful. Therese