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.
Harry Potter and the Half Blood Prince is the book where Dumbledore is killed by Snape willingly. Snape is killed by Voldemort in the Deathly Hallows because Voldemort thinks Snape controls the Elder Wand but it is really Draco Malfoy because he disarmed Dumbledore at the top of the Astronomy tower in the HBP. Hagrid does not die.