Barry Frost, 58, was attacked while walking cockapoo Maisie near Wigan home
He suffered gashes on his arm and a broken foot defending against bull terrier
Terrier's owner Keith Grundy, 59, took control of the dog before disappearing
Admitted having dangerous dog out of control - but animal will not be put down
He was spared jail and ordered to pay £1,000 damages by Bolton Crown Court