When the Justice League is turned into puppies, it's up to Supergirl to look after them. The DEO never realized how much she loved puppies. At least until now. So it's going to be tricky, trying to un-puppy-fy everyone since Supergirl seems more than happy to keep her pals as puppies. But then again, since she is little more than a puppy herself, maybe that's not such a surprise.