I adopted a 14 week old beagle/Australian shepherd 4 days ago. He refuses to walk when we're outside. I have him on a harness and use a 6' nylon leash. He will walk a few steps, then sit down and won't budge. I have tried luring him and rewarding with treats, getting down on the ground and calling his name, pulling him with the leash. It takes us 15 minutes to go 20 feet. I look and feel like a moron dragging and carrying my puppy around. Can I get some help please?