Jin-Roh: Division Chief: You can't put two breeds of dog in one cage. But if you need the two bloodlines in order to survive you can mate them. Bit of a gamble no doubt about that you can never be certain which will dominate in the end. No matter how strong the bloodline it will eventually die out if the dog is not able to pass it on. Apparently some animals when they dominate a group kill off the offspring under them sometimes organizations do the same.