@Grace:
Thanks for the replies! Our B has been great with the Dogwatch invisible fence. However, We have taken a proactive stance and changed the boundaries so her curb access is diminished. The neighbors dog was on a leash but unfortunately lurched 4' into our yard out of the hands of the elder walker. :(. Tyllie (our went to puppy socialization class 2 sessions but she was never keen there either. She liked some and not others. I love this forum and again- very thankful for your help and suggestions. Tyllie loves people and she is a funny and loving B. B's are certainly peculiar and I have loved being entertained by her. Thanks again.
Grace, welcome to the forum! The good thing about this forum is you can take the good advice and ignore the barbs….
My family used the invisible fence with our first basenji, and she definitely outsmarted us. Lucy would listen for the beep-beep-beep cautionary signal, and lay in the yard until it stopped. When it stopped, she knew that she could run around in the neighborhood! We were very fortunate that we lived on a sleepy country road. When the collar battery was good, if there was something outside of the barrier that she wanted, like a little squirrel, she would run through the invisible barrier, yelp, and continue on her way. We were certainly lucky that she wasn't hit, and she didn't see little dogs as vermin. However, one of my basenjis now, Lola, will get snarky with her "sister", Becca, and while it sounds vicious, it doesn't escalate to a raging level.
Have you had your girl her entire life? So if she's 2 and 1/2, she's still a pup at heart. What is your reaction when she gets aggressive? Does she snark first or give any other warning signs (like hackles along the spine, or showing teeth)? Do you have time to get her disengaged?
When she's outside in the yard, I know the collar does the trick (normally), but perhaps during the day, another thought would be to keep a leash on her when she's running around (assuming there isn't any safety concerns with letting the leash be loose)... my thought is that if a little dog runs into the yard, you can step on the leash to get control of your girl.
If you have 2 1/2 years of experience with her, you know here pretty well. If we can help, let us know.