I have three boxers and a female Boston Terrier. A family with an autistic boy who is about 10 sometimes visit the dog park. My two older male boxers pay no attention to the young man nor does the Boston. My 3-year-old female boxer, however, takes a very aggressive stance when he's at the park. It's very strange in that she knows the boy is there before we hit the gate, even if he's not near us. She stands and barks at him continuously as soon as she finds him. She is a very friendly dog and this is the first time I've seen her show aggression to any person. She gets along with all the other dogs, too. Of course, the first time it happened, I got her on lead and removed her from the park. Today was the second time she has not even gotten to go into the park because she started the behavior before we got through the second gate. Has anyone else experienced anything like this? The only thing I've found online in searching deals with dogs as therapy animals for children with autism. My girl, clearly, would not suit that role. Today, I put her in the car and let the other dogs play for a few minutes before bringing them all home. I don't know how often this family goes to the park, but their visits seem to be increasing in frequency. I suppose we will stop going to the park at all. Thanks for any insights anyone might be able to provide.