Tip for remembering this verb: It is the same root word as the English word "value".
so,'Du valjer hunden' - 'You choose the dog' .or could it be "You choose that dog'?
'You choose that dog' would have to be either Du väljer den där hunden or Du väljer den hunden.
den + definite noun but no adjective = that
den + adjective + definite noun = only definite form, not that
So den hunden = 'that dog' but den bruna hunden = 'the brown dog'.
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."