He was the son of a Sussex Spaniel and a Field Spaniel. By 1909, the average weight of a Field Spaniel was . There are a few ocular conditions to which the Field Spaniel has a predisposition. The Field Spaniel remains a rare breed, even in the UK. The Field Spaniel is a medium-sized dog breed of spaniel type. Bullock crossed the Field Spaniel with the Sussex Spaniel and the English Water Spaniel. The Field Spaniel is an active and inquisitive breed, and makes a good companion. Other spaniels recognised as such are the Field Spaniel, Irish Water Spaniel and Sussex Spaniel.