I'm in a basic puppy obedience/socialization class with Megan. She's a 4-month-old Papillon, and is doing very well with some basic commands like "sit," "watch me," "leave it," and "stand..." etc. However, she doesn't understand "down". We're clicker training, and I'm using a treat to try to get her from a sit into down, but she just won't "go down." Any tricks to this? This is my first time training a dog, and clicker training, so any advice would be wonderful. My trainer couldn't get her to go down in class last week, either, so she is being a bit stubborn.