agressive behavior in our puppy

Question
We have a 4 month old boxer/lab/rottie mix puppy, who is truly sweet natured, but agressive with little things.  She has gone after our 1 yr. old daughter 3 times, and just today, bit one of my daycare children (a 2 yr. old, and she was practically hanging puppy with a chokehold to the neck)  I don't know if the agressive behavior (puppy has never challenged me, any adults, or any of my older daycare children, including my 4 yr.old son who has tried to kick, hit, and push her--much punishment given to son) can be corrected, or if I should just have her put down.  She seems to fit really well with the family, put I just don't want to take chance--she doesn't like loud noises, but is now barking at people who stop in front of the house, so is getting protective.  What should I do?

Answer
The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/ For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm  

That site has some additional material on dogs and children.  It is very important that an adult supervises the children and puppy at all times.  

I would spay her as soon as the vet will do it.  The current trend is toward doing it earlier.