12 week puppy showing aggression
Our family just got a 12 week old puppy today. We have a very well behaved 6 year old dog at home (that we have had since she was a puppy.) The older dog is fixed.
When we brought our new dog home today she was growl bark and lunge at our older dog who is about the same size as the puppies mother. Please if you have idea advice or help I would appreciate it.