Last night Thunder (3.5 Months) and I went for our normal evening walk. About 20 meters from the house, someone left thier house and went into the garage and then back into the house, but he fixated on it and though I kept trying to get him to walk with me, he was walking BACKWARDS so he could keep looking, then stopping and straining to go back to the place he had seen the person leave the house from. I was almost dragging him along, but he would NOT stop straining against me to head back to that place. It was 250M down the road before he stopped trying. I'd never seen anything like it from him, but I can tell you I need to do some weights training if I am going to be able to fight him on his leash when he gets a little older!