Clicker training definitely works. This is me training Bruno at 12 weeks and a video of our golden being clicker trained at 14 weeks. I almost didn't try because of all the stories I read about bulldogs being stubborn, even after successfully clicker training other dogs. I'm glad I went ahead and gave it a try. Bruno is well behaved and isn't food or toy aggressive. I think that it is impart to the clicker training. Before trying I watched a lot of kikopup's videos on YouTube and purchased Michael Ellis training videos.