Not sure if this should go in puppy section or not
Lily is 12 weeks old and just loves to play fetch

when she gets her ball, she struts back to you all proud with a 'look at what I've got' look on her face, she brings it back and as soon as you touch the ball she lets go

However if you don't take the ball off her she runs off and tries to either hide it or dig a hole to put the ball in !! She'll go under bushed etc to 'hide' it, she'll put the ball down walk a few steps away the go back for it and start to look for a new place, all the time she's doing this she whines and seems to get quite stressed about finding the right hidey hole.
She just whines and whines and it gets louder and louder until you take the ball off her.
Is this 'normal' cocker behaviour??? Should I discontinue the ball games ?? She's quite happy if you take the ball off her, she'll look at you for another throw and if it doesn't come she wanders off quite happily. I don't want her getting unnecessarily upset.