Shultzy you are so right. Theyellow is realy laid back and easy going. The black is absolutely bull headed but he's mine.I knew I wasin for a challange soon after bringinghim home. At eight weeks old he was climbing overthe 24" tall gate. At twelve weeks he was over the 36" play area fence. Soon after that the 48" fence was no contest. That boy can jump. I told my wife we should put him in one of the big air contest. I love watching those dogs go forhight and distance into the pool.