The breed known as the Cockapoo or Cockerpoo (Spoodle in Australia and Cockadoodle in Sweden) was the result of select breeding of Cocker Spaniels and Poodles in the United States circa 1950. The consequential litters were so wonderfully adorable that by the 1960s, a new breed of dog was beginning to emerge.
Things developed quickly and the new cross breed spread internationally to Australia, Sweden and the UK.
In those early days, the Cockapoo mix used two types of Poodles as preference in the breeding pool - the Miniature and the Toy. Using these dogs, the crosses tend to be roughly the size of the Cocker Spaniel parent or just fractionally smaller.