Thanks very much Becky!

Also thanks for the info ShadowSpider but sadly I can't do much to make my dog chew. She has a jaw disease which prevents her from really chewing on anything. I forget the real name for it but it's known as "Drop Jaw". The muscles in her jaw are very very weak. She can't chew bones or even hard food anymore. We have to water down her hard food for her to eat, if not she just swallows it all whole. I'm sure she'd love to chew on a beef rib, but I know she can't and if she tries she will be in a lot of pain for the next few days. This is why my vet told me to brush her teeth weekly.