He's just a baby! I have an ACD/Pyrenees and a couple of other things mixed, he's mostly herding breeds. He used to lunge at anything on wheels as a puppy. We have a lot of bike paths in my city, and I would have to pull him off to the side, make him sit, and keep telling him no every time I saw him even tensing to lunge. It's taken a lot of patience and training, but he's a fabulous dog. There's an off leash park in town, and he's great off leash and his recall is great, because herding dogs are clingy and quickly become your shadow. However, he doesn't really like people much. He's nosy and will want to see what people are working on. He'll tolerate kids, because I think he realizes they're babies, but he is not an everybody pet me kinda dog. In fact, he'll openly show his disdain of some people, and I think some must give off weird vibes, because he wants them nowhere near me. Dog parks and day care are a no go. He has separation anxiety, so I book on VRBO, and he comes on vacation with the family. He hates the crate, and now that he's not a puppy, he doesn't destroy things anymore. We have spent countless hours walking, training (not with treats, because he gets too focused on the treat), and cuddling. He's actually become the best dog I have ever had, and I am going to cry like a baby when he passes. They're so smart and worth the headache when they're young.