Yesterday it was hot here, so I had the front door open. My neighbors have a black lab puppy, probably around 8-9 months old. He's cute & curious as puppies are. He has discovered that inside my screen door are small creatures (AKA the cats). Yesterday he was just staring at them. He I did not see him make any kind of aggresive move, and he was on the other side of the screen door. Saturday night is when he discovered Levi. Levi hissed at him. He didn't move so Levi smacked at him through the screen. Well yesterday he came face to face with Jordan. I was a little afraid because Jordan is very dog aggresive at the vets office. Well yesterday they were just sniffing each other until Levi came along. Levi did the same hiss & smack which prompted Jordan to hiss. I think it scared the puppy, but as he was walking away Isaac & Maggie started coming to the door too. It is obvious to me that Levi does not like this little puppy. He has met a differnt smaller dog before (a rat terrior I believe). He did his, but no swating at the dog. I am very supprised by his level of agression towards this dog. I'm curious if I need to stop him from being aggresive through the screen. I would like to have a dog some day, and I just don't want him to get so worked up about dogs that I can never have one.