What kinds of bones are ok to give Rebel? we gave him a bone i believe it was half of a ham bone we bought from D&B , it was pretty big, but he started grinding down one side of it and crumbling it and then he would kinda cough and choke a little bit so i took it away, is it normal for it to crumble like that, it scared me because he was swallowing it and i dont know if it will hurt his stomach