I feel for you, I have a similair problem with my male
Akita having fear aggression with dogs.

If I walk him in public, I use a choke collar with a gentle
leader attached.
I do not walk near any people walking their dogs.

If I see a loose dog, I walk the other way.
If a loose strange dog comes up to us.
I yell at the top of my lungs to scare the dog away.
Better that, than it gettng close enough where my male
can grab it.
When my girlfirend use to walk her dog, she walked with
a walking stick. If a loose dog approached and
would not scare away, she would use her walking stick
on the loose dog to scare it away.
You might also want to try behavior training using treats.
It did not work in my sitution, but he did improve.

You might also try one of the yahoo e-mail groups. I believe their
are some on training/aggression for dogs or check out
Web sites.
Good luck.