I will be in a situation with 2 puppies within 3 weeks age of each other. I would like suggestions on advisability and best ways of keeping them seperate, to prevent them bonding with each other. Should I rotate one in the house/yard; other in kennel day to day. week to week etc? Or should I keep them in seperate kennels? Also how long do you reccommend keeping them seperate; until they are a year old? Or Longer or shorter? Your input is appreciated.