Stool softeners are medications or substances that help make poop easier to pass. They make the poop softer and smoother, which can be helpful if someone is experiencing constipation or difficulty with bowel movements. Full definition
After that the child will need to take stool softeners so that it is easier for them to go and no longer painful so that they do not want to hold a bowel movement. (pottyscotty.com)
It would be best to have your Veterinarian take a look at it as soon as possible; your Veterinarian may replace the prolapse (if it is a prolapse - I haven't seen it) and may place a purse string suture around the anus to prevent recurrence with instructions to give stool softeners for a week or so. (wagwalking.com)
When things aren't moving the way they should, stool softener for dogs may help. (medi-vet.com)