I have 3 horses, 5 chickens (4 hens, 1 roo), 3 ducks (2 hens, 1 drake) and a very well behaved female pitbull. The dog lives inside but has to share the yard with the birds. Everyone gets along for the most part, except that my drake (Nigel) has been chasing my dog (Lizzie) around the yard and biting her. Liz knows the birds are part of the pack and won't bite them, but she will tell Nigel off for biting her, like she would another dog. The problem is that Nigel can't take a hint! Nigel doesn't bite humans- just the dog. I have trained the birds to come when I whistle. Does anyone have suggestions for training Nigel to leave Lizzie alone? Please help!