Well, I'm not a furry, but when I'm out for a walk and the dogs behind the fence are barking at me, I'll start barking violently at them until they stop.
Ha! Oh, wow. This is exactly what I do. Usually I also plan out a method of combat if they jump the fence.
What I've worked out thus far is - if it's one dog, you wait for them to reach you, then:
1) if they pounce, punch down their throat, or
2) if they don't, knee them in the face. With your knee.
Or if it's 2 dogs,
1) Take one out if you can, or
2) Run past them and jump over the fence, and grab a yard tool!
Also, sometimes I growl at the TV if there's a hypnosis program on and it's telling me to growl at the TV because there's a hypnosis program on and that that would be a good idea to do right now.