Barton wasn't enjoying himself at the Stadium of Light

Vanderlei gets bitten by police dog during touchline scuffle

The incident started after the referee’s assistant overturned his decision to disallow a goal against Caxias in their first-division match against Novo Hamburgo, promoting Vanderlei and his team-mates to swamp the officials.

Police joined the scene after the situation stared to escalate, and one German Shepherd, who was being held on a leash, decided to take the matter into his own mouth by trying to take a chunk out of the nearby Vanderlei.

Video footage of the incident shows the striker having to be treated on the pitch after the bite, but he was eventually able to return.

Caxias went on to lose the match 1-0, courtesy of Paulinho Macaiba’s controversial goal.

McCulloch: I'll play for free to save Rangers

Rangers star Lee McCulloch has offered to play for free to help the Glasgow club out of their financial crisis.

And the show of loyalty has impressed Paul Murray, a key man in the 'Blue Knights' consortium that is trying to take over the club.

"Lee McCulloch epitomises everything that Rangers Football Club is about," said Murray. "It's about people like Lee and Ally McCoist - people who love the club and are prepared to do anything they can to defend the club and to save the club.

"It's an incredible gesture."