It's really a hard choice. Dogs are lively, adorable and loyal. Cats are proud and elegant and have really good-looking face. Really hard choice. I love them both.

To take a screenshot on Chromebook, just press "Ctrl + Window switcher" keys simultaneously, you will get a screenshot of the full screen. To capture a region, press "Ctrl + Shift + Window switcher".

You can use key combinations to take screenshots on Mac. 

cmd+shift+3 is for a full screen

cmd+shift+4 is for a screenshot of a certain selection which you choose by using the trackpad