Hey, we got Roxie @ 10 weeks, then Madie @ 8 and Petie @12. We did notice a big difference in our dogs. Although all of ours had been socialized, Madie just lacked something, she was healthly and everything,but I worried about her constantly, and after we had her about 3 weeks I felt she was at an age that she should have been when introduced to a new home. Now that we are getting started breeding we are planning to wait till our pups are 11 to 12 weeks to leave. and I will never take a pup under 10 weeks home again from another breeder. What does it hurt to keep them with their sibs 14 more days? We sure feel that Madie would have benifited.