All movements are possible in each region of the vertebral column, with the range of motion determined by disc thickness and articular process geometry. The movements of flexion, extension and lateral flexion involve compression of the intervertebral discs at one edge and stretching at the other.
It is important to note that rawhide bones and chews made in USA are the absolute best for your dog. Choosing American Rawhide, Merrick, Dingo, Bone Buddies or Beafeaters brands you give your pet a rawhide chew of premium beefhide from corn-fed American cattle produced under the strictest quality standards. American production processes and sanitation practices are much better and more highly regulated than most other countries producing rawhide bones.
Apples aren't bad for dogs. I give my dogs apples as treats and they love them. I just make sure to core them/take the seeds out. You probably shouldn't let your dog have them too much though (just as a treat). I've also had bad experiences with rawhide treats..not good.