Wireless perimeter fences, and some other advice

[7mmfan]

I have a 7 year old lab, Chloe. She is a hunting machine, and the sweetest dog on earth.... until it comes to little dogs. I've known this for a while, and have been able to successfully avoid any conflicts until tonight. I was working in the garage, let her out in the yard to potty, turned my head for a second and she was gone. She left the cul de sac and went to visit some people down the street. They said she was as friendly as could be until their little dog came in and she immediately attacked. The little guy is fine, thankfully they were there and were able to quickly separate them.

My 2 questions are:
     1. Can anyone recommend a good wireless perimeter fence?
     2. What can I do to work with my dog on this little dog problem?

I've found a few wireless fence systems online for around $300-$350. They have a 50-70 yard perimeter from the transponder. This would work perfectly, but I want to buy one that will work so if anyone has a good suggestion I'm all ears.

And lastly, can anyone give me some tips to help work with my dog on her aggression issues with small dogs? I do not want the liability of this hanging around. Its always in the back of my mind when we're camping, hiking, at bbq's, etc. Or is this just something that is ingrained in her and I'm going to have to deal with it?

[JJD]

Have had experience with one wire electronic fence, it worked ok but be prepared to do the required training of your dog to make it work as intended.  Same goes for wireless. Like an e-collar, only trained to a different type of result.  I found system maintenance to be more than I had hoped.  I would not do it again.

Only aggression issues I have had with "Labs" have been with males.  Had a great male that was good enough that I was thinking about studding him out. When his testosterone kicked in he became mean.  Had him cut and within 5 to 6 weeks he was tolerable.  Glad I did it before I put a lot of $$ into Hip and Eye tests and a couple grand in titles.  He was an excellent hunting dog till he died.   Is she Neutered ?  Might want to talk to your DVM about the issue.
Only female issue is with my Chessie.   Per breeder suggestion, I let her go through one heat cycle before neutering her.  While she has tremendous fire and drive, I wonder if not waiting for the first cycle would have made a difference.  But then again, she is a Chessie. 

[cbond3318]

I put in a single line electronic perimeter fence, the kind that looped a wire around the yard and the collar would zap my dogs once they got to within 3' or so... Both dogs (lab and Husky) were around 7 y.o at the time. Worked ok for the first couple days until the lab learned if he just kept his head down and blow through he would get past with just a quick few zaps. The husky would go up to zap line and then take one good leap and he would be over the line. I wasn't too impressed but then again my dogs were 7 and wise. it might work good if like said you spent the time to train him into it and while you are with him elevate the consequences beyond a little zap or buzzing sound.

[7mmfan]

She is neutered, and we waited through her first cycle to do it. She did not become aggressive until a couple years ago, heck she lived with a Chihuahua for almost 2 years with no issues.

I've been doing some online research today and i'm correlating a lot of what I see in her to possessiveness and lack of leadership. It makes sense as the aggression towards small dogs started about the time that I had to start leaving her at home for work every day. I'm going to have to find a way to work on that, and work on her possessiveness as well.