At 4 months old they are going through the terrible"pounce on everything" stage, as i call it. Mine have been great with my birds, but one pup all of a sudden whats to pounce on one goose.... so I am keeping a good watch on them and a sharp NO if he even looks like pouncing. Any other time the geese are biting him and playing. My adult dogs are great with all my birds, don't even give them a second look when they come and steal food from their bowls while they are eating. Puppies take time to learn and GP's are puppies until 2 or so. They are also mostly outside dogs and enjoy being with the animals.