German newspaper Bild reported the man’s penis has so far not been recovered from the scene.
Lemanis, from the Bochum police, told the German tabloid: “The man has been put into an artificial coma by the doctors. We hope we can interview him soon.
“One hypothesis, of course, is that the dog, which is about the size of a Jack Russell terrier, bit off the penis and ate it. The wound could also be a bite wound.
“But it’s also possible a sex accident or a crime”: he posited.
Police have since said they firmly believe another person was involved in the incident, and that the dog played no part in an attack.
“The separation of the genitals was definitely done by another person,” police said.
In 2012, a 61-year-old Austrian man was attacked by a dog on the loose and had his genitals bitten off.
After he was rushed to hospital and underwent a several-hour operation, they were able to save his genitals.