Retail workers were left shocked after a dying dog was found dumped in a bin bag behind a Tesco supermarket. The RSPCA has launched an investigation after the pooch was discovered abandoned next to rubbish inside a tied black bin liner. The animal was found in Church Road, Yardley, Birmingham at 1.30pm on Sunday. He was unable to stand because of breaks to his neck, back, legs and ribs, was covered in mange and severely underweight. The neglected pup, which was around six months old, was rushed to Birmingham Animal Hospital. However, he sadly died while on the treatment table. RSPCA inspectors…