I have a 1.8 year old Pyr who is wonderful and sweet with humans, and who has been in training since we got her which was about 4 months. She is, we though, very well socialized with other dogs. We have never let up on training. In fact I would say that she is better trained than your average dog. Some reasons I say this:
Every Saturday, almost without fail, we have taken her to obedience school, since she was about 4 months old. We have missed maybe a handful of times.
We train her also at home several times a day for a few minutes at a time.
She has been clicker trained for a good portion of that training.
She will wait some distance away from her food and not approach it until she hears the "Take It" command.
She has a reliable In_Home 10 second Leave It, with "Take It" as a release.
She has the same caliber "Watch"
However, she has lately become so agitated by passing cars (especially on cobblestone) that she lunges and barks very menacingly at the car. She is a big dog and she is very strong so this is starting to become a very big concern. I have tried the techniques in a book called "Feisty Fido", that is trying Watch to divert her attention when on a walk to no avail. All I can do is tug on the leash when she does this and yell at her. I do not think that is the correct response! But I am at a loss as to what to do. She is starting to also do this with other dogs.
What is the correct way to handle this? Please help!