Older dog aggressive
(Vero Beach, Florida)
We have a female dog, Daisy, who is just turning 2, she is a mix breed of Catahoula hound and Australian Shepherd. We recently just got a female puppy, Dakota, and she loves the puppy. The puppy, Dakota, seems to be the more dominant dog, as Daisy has always been more easy going. Daisy does bark and her hair stands up on her back when someone new comes to the house, but she has always backed away and then been very friendly.
Well recently someone new came to the house and she ran up to him like she was going to attack him, barking, and didn't seem to want to stop right away, she eventually did, but scared the guy to death! We also had someone come to the house that had a 10 year old boy, she did the same to him, which she has never been like that with a child. Not sure if she is trying to become the leader of the two dogs, or what is going on!
Daisy is such a loving and wonderful dog, this is so unlike her! What should I do or how should I go about dealing with this?