It is similar in shape to the smaller Sussex Spaniel. This marked the first time a Sussex Spaniel won that group. Additionally, small dogs from Sussex Spaniel litters were called Cockers. He was the son of a Sussex Spaniel and a Field Spaniel. The Sussex Spaniel is considered difficult to breed. Other spaniels recognised as such are the Field Spaniel, Irish Water Spaniel and Sussex Spaniel. Bullock crossed the Field Spaniel with the Sussex Spaniel and the English Water Spaniel. Stump's co-breeder Dee Duffy had another Sussex spaniel named Ch. The Sussex Spaniel is a breed of dog native to Sussex in southern England. The Sussex Spaniel was first developed as a breed of dog in Hastings in 1795.