The man — who an eyewitness described as slightly built, between 60 and 70 years and without pants — was allegedly witnessed in the act by a farm hand who was passing by the field on Monday afternoon.
“The employee saw it when it all was, so to speak, coming to an end,” Ronneby police inspector Ronny Götesson told the Swedish language newspaper Kvällsposten Daily. “He was so shocked that he did not have time to stop the man who did it.”
The witness said the alleged sheep rapist bound the sheep’s back legs together to make it easier to commit the act, The Local reported.
It is unknown whether the sheep was injured during the act, which could be crucial to any arrest.
Sweden decriminalized sex with animals in 1944, but perpetrators can be tried for animal cruelty if the animal is deemed to have sustained injury.
Meanwhile, the suspect remains on the lam, but could be facing a more serious problem than just being arrested.
A study published in the Journal of Sexual Medicine last November found that men who have had sex with animals were twice as likely to develop penile cancer as those who stick with their own species.