I just introduced my 11 week old pup to his first pigeon yesterday. For the past two weeks he has been playing with pheasant wings. He chased and pounced on that pigeon like he had been doing it for years. I did cut the flight feathers. I think he could have chased and pounced on that bird all day. I only let him twice to start with. Always have them want more.
I agree that I would never introduce a pup to a full grown rooster. I raise them and they can be mean with those spurs. If the pup is spurred -Worse case the dog is shyed off of roosters all together, best case- the dog will crunch any fallen bird if it has a ounce of life in it to avoid another spur scratch. Crunched birds don't make good table fair or wall decorations.

-Mathewsconquest2