Bruiser, the big red puppy, is very agressive. This morning, he attacked Parker and his mom couldn't get him to stop. I finally had to swat him gently on the bottom to get him to back off her. Then I picked him up and said NO sternly as he screamed his head off. Is this normal in 8 week old puppies? Does it mean he will always be agressive? Not knowing who the father is is worrying, too. Bruiser picks on his brothers, too, but this morning, it was over the top and he just kept going. Parker is fine, no bites or anything, but he scared her bad. Is this normal with the boss of the litter and eventually it can be trained out of him? Or should I insist he be an only dog when he's adopted?