Ok so my really good friend Kristy came over the other night and brought her 4 month old chihuaha Coco over to meet Oliver. We get together to watch the Bachelorette every Monday night so I asked her to bring her pup over so that Oliver and her could play

Well it was too funny! As soon as she put Coco down to meet Oliver, he jumped on her and tried to hump her! Now Oliver is only 15 weeks sooo I don't think it was sexual in nature, I'm pretty sure he was just trying to show his dominance but I still freaked out! Is this normal though? Should I just let them play or was I right to say "no" and separate them? It was pretty funny but I'm so new to owning a puppy that I wasn't sure what I should do

Haha those two are so funny together though!