Why won't my wolfs get up in mincraft?

So I'm watching tutorials on youtube about minecraft, And the guy in the video said that we CAN download his map and follow along, i downloaded it so i get some wolfs. (i was to lazy to catch one my self) but when i opened the new world and converted it the wolfs were sitting down, so i right-clicked on them but until now they won't stand up WHY?

They aren't your wolves they are his and therefore you can't command them