Make a house hold of 2 foxes. One male and one female, these will be your alphas. Your alphas are key to the packs survival. If both alphas die before the offspring are of age, you lose. You must not have any sims. A way to do this is by deleting them. This is the only part of the game when you can cheat. Also when building your "den" it is recommended that you have a small basement with stairs leading to it. You may use the moveobjects on cheat to cover up the stairs. While the alpha female is pregnant she may not leave the den at all if she does it has a consequence for however many sim hours she is out. When the cubs are born. The penalty for leaving is far more severe. And if a pup leaves fro more than a hour. You either have to abandon it, or kill it off using cheats (only for this!!!!). The fox alpha male must have these following traits, shy,hyper,adventurous,quiet, and likes swimming (you can use cheats to obtain the traits). The alpha female must have, shy, quiet, lazy, hunter, and proud. And if your pet gets into a fight, if it loses the pack will either reject it, or you must kill it off, similar to having to abandon or kill like when they were cubs. Now for points.

Win a fight- +100 points
A new generation- +50 points
Lose a fight - -50 points
Lost pup (either abandon or killed) - -50 points
Additional cheating -500 points
Killed alpha (besides from old age) - -100 points
Human enemy- +40 points
Human Friend- -50 points
10th gen- +300 points
Have a fox win 5 fights- +1,000 points (plus the win a fight points!)

Now for some things: a fox http://www.thesims3.com/assetDetail...assetId=8216444 , another fox, http://www.thesims3.com/assetDetail...assetId=8441710 , preferred world, http://www.thesims3.com/assetDetail...assetId=8357446.
Expanison packs needed: Pets

Sounds cool, I already want to give one of my Sims a pet fox. I may change this challenge for wolfs though.

It sounds good, but how are you supposed to feed the foxes without humans? There are some plants that they can eat, but there aren't many just growing around.

I make the foxes cats so they can hunt. I'm not sure how to hunt as a dog