Along with the suggestions of the other poster it could also be her anal glands, they may need expressing. Definitely a vet visit is in order and the sooner the better. If it is teeth, ears or anal glands they will NOT get better on their own.

Please see a vet as soon as possible.

My Doxie also has a full-body odor, not just her mouth, or rear, or ears. Again, HELP!!!