Aggressive Kelpie puppy
We have a 9 week old puppy who attended his first class at 'puppy preschool' and proceeded to actively play with some puppies and became very aggressive with others. Biting, hackles, growling etc. ended up in a couple of disturbing brawls. Usually with larger pups, but all roughly the same age. We are very worried that our gorgeous little pup may be aggressive. This was not play but real fights.
is there anything we can do to change this behaviour. I have read the puppy school is actually very unnatural for puppies and causes fear and intimidation that will often become aggression.
should we keep going? desperate for some advice.