By Graeme Murray & Kelly Ashmore A neglected dog dumped outside a rescue centre ‘changed colour’ after being given a much-needed bath. The animal’s matted fur was first believed to be black and dark brown. A good groom, however, revealed a fluffy, golden coat as he was literally transformed into a different beast. The Shih Tzu/terrier cross was discovered outside Birmingham Dogs Home’s Wolverhampton rescue centre. Centre staff said Oliver was freezing, petrified, and badly neglected and needed around-the-clock care during his recovery. The dog was nervous and scared when he was first taken und…