Thanx you guys! You are so helpful! I have started Nikki on "unaggresion" by not letting her sleep on my bed, not letting her jump up, making her sit and wait before she eats and goes outside, and making her heel(which she is doing very nicely). She is a very good dog until she meets other dogs that she does not know or does not like. I will try to find books about that in the near future. Thanx again!