Livestock guarding dogs, who's sole job is to keep wolves away from domestic sheep, have apparently been falling in love with the enemy and producing hybrid pups in the Caucasus Mountains. Researchers looked at DNA from both local wolf packs and guard dog populations and found that ten percent of all offspring were the result of romantic co-mingling between the two canids. In the Caucasus Mountains dogs are left with herds of sheep in remote areas without human oversight for long periods at a time. Left to their own devices, they apparently consort with the enemy.
If you can't be with the one you love, love the one your with.