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"My first Blue Heeler was ACD registered and female. She was what I would call the perfect dog. Well behaved and loved everyone. She was protective of me and would attempt to bite only if she felt I was threatened. It took me ten years to get another Blue Heeler without feeling like I was trying to replace her. This time I bought a farm dog, not registered but certainly pure bred. He is very different from my first one. He is very aggressive with everyone except immediate family (this includes about 7 people), I mean he is even aggressive toward people he saw weekly when he was a pup. Doesn't matter if it is adult or child. He also a submissive/excited dribbler. pee pee pee....not as bad now that he is a year old but he still does it with most except me. I don't know what made him the opposite of my previous heeler and I should not compare but I thought I knew the breed from her behavior and he is similar in some ways but different in so many others. SO hardheaded. I socialized him as a pup and had family to include kids around him every weekend, took him to puppy class which he excelled (top of his class in obedience) except after that seems to be when the peeing started. I run him at least 2 miles every day if possible on the treadmill and play ball or Frisbee when time and weather allow. It sucks to have to lock him away every time we have company. Anyway, despite his attitude, I adore him and he makes me laugh. Like a comedian. My first heeler was always so serious and he is constantly being silly. Example...when I refused to play with him because I was watching tv one night, he kept shoving his toy at me and juggling it around in his mouth. I still refused to play so he put his toy in the toilet which I found after I went to the bathroom..eeeew. Any advice on if his aggressive behavior is a normal trait would be great. I am hooked again though even with his faults, I love him."