I was getting Chewbacca out of his crate this morning and the whole time we were going through our morning ritual he was making these little whining sounds but they weren't whining like he was upset. They were more like happy little grunts. Not very loud or anything but just happy little sounds. I never noticed anything like this ever before. Is this a sheltie thing for them to vocalize like this do you think or is it just a puppy thing?