Why are all of the sudden in the last 2 weeks are my 2 female labs barking and growling at each other? They are showing teeth and bark non-stop until someone stops it. They are sisters and have been together since birth. They are now 9 years old. FYI... we did get a new male puppy about a month ago. But the 2 labs do not bark or growl at the puppy.
Thanks!:)