Thanx for all of your help!
Ahem... First of all, Dixie. I hate to say it, but I can't afford to enroll Nikki into a class. I wish I could, but it's just too expensive. Even if it was five dollars, my mom wouldn't spend it. That is a good idea with the men, but I've already tried it, but she will not go within 10 ft of a man, and if she does, she'll bark and run away. I keep trying it anywhere we go, though.

Carrie,
I will try all that you said, but you don't know Nikki. She gets so jealous when I pet other dogs around her. She will not tolerate all of that attention to Abby, and not her. She is spoiled, and if I pet any dog that she doesn't like, she'll explode! She doesn't mind when I pet most dogs, just the ones she hates. Like Abby. I will try it though.