Take a look at it, is it clean? wash it off, remove any dried feces, some longer haired dogs get this and need washed there from time to time. you dog could have had diarehha you may not have know it and now some of it has dried up there, I know it sounds awful but you need to take a look.
chew your butt
Get the dog some good chew toys. Dogs need to chew.
Yes, A dog could vomet after eating a chew toy
rice
It's dog's butt.
No, but chow is.
A Bone
You will poison
A Bone
It's awful to imagine it but if a dog is in enough pain and distress it might be driven to chew off a toe.
No They Will Die.
being friendly