I am on my second pair of GSD's. I think the behavior you describe is normal. They act a lot like little kids (teasing). Many times toys or bones will lay around and neither one could care less about it until one starts playing. Then the other will get jealous/possessive.
To be honest, they're a lot like my 2 and 4 year old children. I wouldn't worry about it.
John
To be honest, they're a lot like my 2 and 4 year old children. I wouldn't worry about it.
John