Keep the diapers in a location that the dog can't get at.
You should pick up the other dog poo so the other dog can stop eating it
Feed it.
tell it to stop it and wack it
Is there some sort of medical issue your dog has which requires diapers? If not then no, your dog doesn't need to have diapers on, it needs to be potty trained.
Definitely take it to the vet. The cigarettes could kill the dog.
The show Dog Whisperer had an episode about a dog who had an obsession with eating rocks. That will give you an idea of what to do.
kill it.
Go to pet store or tractor supply.They have pills out to stop your pet from doing this.
Yes Dogs do have diapers it is called the dog tampons
try too pull
Get the dog some good chew toys. Dogs need to chew.
although most dogs have a good immune system, but there can be a chance that the dog gets sick. I would recommend a quick check by a pet-docter. Its not deadly, if that is what you are asking ;)