Almost every day as the opening of our whole group activities, we do a think-pair-share where the kids turn to their partner and I give them a minute to "debate" a topic. For example--should women be soldiers? Or what is a better pet-dog or a cat? One takes each side and they discuss their reasoning.
So, I didn't think they'd have a problem with making an argument for whether or not dinosaurs made a good pet. I assigned the girls the pro side and the boys the con. Here are a few things they came up with: