I think Sky has developed a 'thing' about people being behind her when we're out. I only noticed this about an hour go. When we're walking and someone is behind us, she'll stop, look at them, walk, turn back, and jump about a little. She's easy enough to control, I'm just wondering why she does it. As soon as the person has passed us she calms down and walks normally again. Is it the herding instinct? It's very confusing because she's never done this before.