Oh no, a good breeder can pick out a pup for prospective family. Mine started showing some temp as young as 7 wks. My 2nd Fila, Belly bit for the first time at 7 wks, she drew blood and was growling. She was not kidding at all. Her temp was off the hook as were the temps of 4 other pups out of the litter of 6. My first breeder called and said to come and get the little spawn since he was the one she went after He was cleaning poop from their sleeping area and she woke up and then growled at him and when he continued what he was doing she nailed him. After she went over and went back to sleep. He said she went after him again in the morning while he was getting he pups out to go outside to sunbathing and potty. She was very intense as an adult and hated me being pregnant. Even went so far as growling at my belly every time the baby would kove. I actually had to take her back to my breeder when my daughter was about 5 month's , she was so jealous of the baby that I couldn't trust her. If I was holding her she would sit behind me and growl. I had never had one ĺike her before that or since. She was 4 yrs old when my daughter was born.My other Fila couldn't get enough of my daughter and would come and get me for every little peep the baby made. I trust my breeder to know which pup or pups in the litter will fit in best with my family. I prefer very strong temps, but also like a bit of a laid back attitude with it. That's my Maddie girl to a tee. She is so laid back with my kids it's crazy, but hen she will flip that switch in the blink of an eye. She has been like this from when we got her at 10 wks.