JJ has no problem putting her feet on a book, however she prefers to do it laying down! Down is a default behavior for her, so the first times she put her feet on the book she was laying down, so I clicked and treated. Now she's chained that and I can't seem to get her higher than a bow with her feet on the book with any consistency. I can't really approximate standing from a bow very well, should I just hold out until I get standing and foot on the book and start only rewarding for that? She shuts down pretty easily if she gets frustrated so I want to avoid that if possible. Suggestions?