Hi everyone! I'm new to this post and a new dog owner, I've had family dogs but this is mine and my gifriends first dog. He is a border collie x golden retriever. He's very intelligent and doesn't even act like a puppy much anymore but he's only 9 months. We take him to the dog park once a day and recently he's been barking at smaller children. He's never done this before so I'm open to all input! Thanks ?