This is a picture of a male dog from behind. In expressing the bowels, you are only helping provide stimulation where the body is compromised and needs help. Carefully using a gloved finger, you can begin gently pressing and drawing circles on the area above the anus which usually will stimulate contractions of the colon and produce feces. Once your dog begins to pass feces, continue gently drawing those circles until he’s done. Don’t be in a hurry. I use my other arm to support the dog in the ‘pooping position’ and also to stop them from leaving while I’m helping him to go. Please ask for help from your veterinarian.
See also: Bladder Expression.