How old is Lana? Zod? (cute names!) its possible that as he gets bigger they will do better. I'd just keep an eye on them and then seperate them when you cannot. Im sure they will do better in time, sounds like its just playing right? This is not fighting is it?
__________________ “Petting, scratching, and cuddling a dog could be as soothing to the mind and heart as deep meditation and almost as good for the soul as prayer.” ― Dean Koontz |