I'm sorry that I can't offer any advice, but I can offer my sympathy. Samson does the same thing as Boomer anytime anyone besides my husband or me comes into the house. It doesn't matter if they ring the doorbell, knock, or walk in with us. In fact, we've joked that people may not believe us when we say we have 3 cats because no one ever sees Samson. We get excited about small steps. The other day, he actually walked into the room where I was tutoring a student. Samson walked over his food dish and had a little snack, like nothing unusual was going on. I almost fell out of the chair when I saw him!