Cari sounds like she has a definite aggression problem. Like Karen said, make sure she is on a leash all the time when she is around other dogs and when she goes after them yank back and in no uncertain terms let her know that that behavior is unacceptable. Also, if you give her attention AND the other dog too at the same time, she might not feel so intimidated and think that you are going to leave her.

I ask the same question. How old is she? Also, I may be having a brain freeze here, but what kind of dog is she??