Male Chocolate 7 months, got him at 2 months. Perfectly normal until a few weeks ago. He won't go across the runners in the hallways. We thought he may have skidded so we carpet taped them down. He won't go across the 12" x 12" return air vent, so we put a mat over it. He will go out but not in. He hesitates going down the 2 stairs that lead to a ramp to get outside. Taking him in and out for his business has turned into a nightmare. We have tried treats, getting on the floor and either trying to coax with a treat, going down into play position. This isn't our first rodeo, we've had labs, retriever, sheppards...never seen anything like it. For what it's worth, he's the first Alpha dog. We're getting a pinch collar this week but not sure if that's the answer.