Would this be considered a command?
Because in English, "You choose the dog" is a command, and "You are choosing the dog" is not a command. I assume not, since when I scroll down on the home page, there is a section labelled "Imperative", but I'm still unsure.
"You choose the dog" isn't a command in English, it's simply declarative. "Choose the dog" is imperative. Or, if you want to keep "you" and still make it imperative, there has to be a comma after it to indicate the person is being addressed: "You, choose the dog."