The ability of a dog to learn from humans has often been linked to its intelligence. Using the dog breeds topic from PetBreeds and data from The Intelligence of Dogs by UBC psychology professor Stanley Coren, we found and ranked the 17 least intelligent dogs by obedience intelligence.
Decades later, in 1945, Dumbledore finally defeated the now-Dark wizard Grindelwald, who had come to possess the Elder Wand. Grindelwald's defeat made Dumbledore the master of the Elder Wand, which remained his until just before his death, when Draco used the Disarming Charm on him.
Rita Skeeter's tell-all book about Albus Dumbledore reveals that when young Albus was about 17 years of age, Gellert Grindelwald, also about 17, came to Godric's Hollow to live with his great-aunt Bathilda Bagshot. He had been expelled from Durmstrang for near-fatal attacks on other students.