Rugby star in dog sex scandal.

From News.com.au:

Canberra Raiders and Australian rugby league star Joel Monaghan is under investigation after a photo emerged showing him in a compromising position with a dog.

Monaghan described the incident as a "simulated act" meant to be a prank.

"Joel can't blame anyone but himself for an act of stupidity that will haunt him for the rest of his life," manager Jim Banaghan said in a statement.

"Joel wants to make it clear that he was the one playing a prank on an absent team mate by simulating the act.

"There are no words of explanation that can be offered because none can be appropriate.

"Joel has to now face his family as well as fans and supporters with that shame and has already undergone counselling to help him cope with the consequences of what has happened."

Raiders Chief Executive Officer Don Furner said an investigation was under way.

"If he did it, it is something he will live with for the rest of his life," Furner told a media conference.

"We don't know whether it's authentic but I am as appalled as everyone else.

"If he did do it, I don't know why he would do it."

The incident reportedly happened during the Raiders' Mad Monday celebrations following their finals loss to Wests Tigers.

The NRL says it will await the outcome of the Raiders investigation.

The photo was reportedly posted on the internet on Monday before being taken down by the Melbourne radio station that had put it online.

The action was too late with the image being re-posted through Twitter.