In Harry Potter and the Goblet of Fire, Dumbledore asked Professor McGonagall to bring Hagrid's dog Fang to his office before questioning Crouch Jr. Why did he do this?
"Minerva, kindly go down to Hagrid's house, where you will find a large black dog sitting in the pumpkin patch. Take the dog up to my office, tell him I will be with him shortly, then come back here."
—Harry Potter and the Goblet of Fire, Chapter 35 "Veritaserum"