I saw a couple of girls (20s) walking along the pavement fairly fast and chatting together. 50 yards behind them was an old collie cross limping and struggling along. They never once looked back or slowed down. They disappeared round a bend and the poor old dog tried to run a few steps but had to stop. I wish I had called out to them but by the time I realised there was a dog they were more or less out of sight. What is wrong with people.