Cocker Spaniel
Medium
England
In the 1800's, small spaniel dogs were breed to help flush and retrieve game. Only the best hunters were used for breeding. This created the most efficient puppies for the next generation, but the outcome of these hunters was not very consistent, so a split was made. Essentially only the sizes of the pups counted and The Kennel Club divided the dogs by weight alone. If a dog weighed under 25 lbs, it was classed as a Cocker Spaniel (as its primary use was to hunt woodcock). If it weighed over 25 lbs, it was a Springer Spaniel (which was used to "spring" game).