I few days ago I was in an office where a man was using a service dog. I think the man was partially sighted, not sure. The dog looked at me while passing by, like he would have liked a head-pet. I deliberately ignored the dog so as not to distract the dog from his job. I've always taught my kids never to pet or play witt a service dog, they're on-duty. However, I felt bad about it later. I didn't want the dog owner to think I was being rude to him. Just what is the proper way to handle a friendly service dog?