I would save the most important one
And I would rate the life of my dog more than the life of a stranger - and many more times that the life of an enemy.
I find it a strange viewpoint that people today consider all people to be in the same grouping when taking discussions like this - when in actuality there are many many groupings of people and many of them do not just dislike but fundamentaly hate the others. Thus by saying you would save any human you are saying that - if in the situation - you would save Hilter too? (just an example I could pick others - Bin Ladin for example or Mao) Is this the theory of forgivness comming out in us? I think not - rather I think it a line people take so that others do not judge them harshly or feel endangered by that other person -
I also find it odd that people are willing to take an animal and make it part of the family unit - and then abandon said animal because it cannot speak or walk on two legs - or maybe it can but it has wings instead of arms.