That would be called the "See your doctor immediately" rash.
If intestines are protruding through his rectum, it is an emergency. Get him to the vet as quickly as possible. This can be a symptom of severe illness, but regardless of the cause it can result in death of some of the tissue of the intestines which can eventually kill the dog.
It is most likely a "prolapsing internal hemorrhoid" (a large rectal vein protruding). This is common, but see a specialist promptly for treatment.
You need to take him to the vets as soon as possible so that the puppy can get help.
because it has a complete muscular layer around it
around 8".
The rectum is not at all involved in actual sex however there is a lot of nerve tissue around that area as welt the stimulation of which some find pleasant.
the rectum
the rectum is attractive
The large intestine does connect to the rectum.
Nothing is digested in the rectum, the rectum is the final storage place for feces before they are excreted.
The rectum.the rectum or the decending colon.
Cancer of the rectum is the disease characterized by the development of malignant cells in the lining or epithelium of the rectum