It could be a number of reasons. Fleas is the first thing that comes to mind. Stress will do it too. Or if the dogs anal glands are impacted that will do it too. Unfortunatly that last one requires a vet.
Get the dog some good chew toys. Dogs need to chew.
Yes, A dog could vomet after eating a chew toy
rice
No, but chow is.
A Bone
You will poison
A Bone
A dog likes to chew on a "bone." Changing one letter, it becomes "zone."
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
because they itch