I've recently got a gsd pup who is 6 months old and she has been kenneled her whole life. She's from working lines so she's very drivey and always on the go. She's generally perfect in her crate but when I put her in her run she jumps against the fence in an effort to get out and i'm worried she'll hurt herself. She usually just sits by the front of the fence and waits for me to let her out. Any advice on how to get rid of this behaviour?