N.B.
Call him, message him, if he hasn't come to pick up the dog by Friday then write him a letter, maybe even registered, and inform him that he has 1 week to make plans for this dog or it will be taken to a local shelter or that you'll be advertising a free dog on social media but with a warning that it's a bit aggressive.
Maybe give him until Friday November 3 or Monday November 6, in the letter, because that gives him time to receive the letter, you get a notice it was delivered, and then a full week to get the dog gone.