As someone with a service dog, he too has alerted to others. I had a class once in college and he kept alerting to a girl in my group. I asked if she had any health problems and she said, “no, not really? I Just get migraines sometimes.” I immediately said, “you’re going to get one soon, then.” Sure enough, by the end of class this girl said she was going to go back to her dorm because she was feeling sick, from a new migraine. What’s hilarious is that he’s not even primarily tasked for migraine detection —I don’t get them all that often. But I’ve seen several similar stories in the SD world and it always makes me smirk. Dogs really do know us better than we know ourselves.