In 1940s Maine, scientists built a facility to breed a hyper-intelligent 'super dog', studying over 500 puppies across five breeds for 13 years. Funded by the Rockefeller Foundation, the experiment sought to prove intelligence was hereditary, but its findings instead helped discredit eugenics and reshaped understanding of canine development.
1940s US 'Super Dog' Breeding Experiment Failed
Source: BBC