Officially to EBN.... THOR is one very handsome boy! And, a very typical stubborn OCD Bulldog..... Have you read 'Nothing in Life is Free' (NILIF)? It is a great training tool which teaches the they need to work for everything, positive reinforcement.... Treats, food, and affection which Bulldogs respond best to.
walks seem to be a common issue and you have to really be persistent use a hog value treat to get him to cooperate! he only gets it as he does what you have requested/command.
i am going to tag a few other members that might be able to give more advice.