Well, now we know how to defend ourselves against aggressive dogs...
get a pet porcupine. Ha!
This poor dog, named Inca, is doing alright after her run in with a Porcupine. Thousands of quills were embedded in her face, head, ears and even in her tongue.
Inca was put on pain meds to get over the initial hump. Then the breeder and the veternarian knew enough to pull and cut out what quills they could while the rest worked themselves out after about 3 weeks.
These are tough dogs and they have the
ability to disregard lot of pain. This ability is only
outdone by their stubbornness! Ha! Ha!
The porcupine
didn't walk away from this one, and actually kept coming back near the house and so they are testing it for rabies. Animal Control is concerned, as it
is peculiar for a procupine that is mature to go
wandering up near a house with three dogs.
The other two, at least, had sense not
to get involved and were not quilled. Inca on the other hand, I guess
took it personally.
These little guys are resilient and obviously stubborn, here is a picture of Inca before the quilling.
Here are a couple of other dogs that found themselves in the same predicament.

WATCH OUT KITTY!!!

MORE ON THE PORCUPINES... 
Porcupines
are large rodents. The most characteristic feature
of porcupines are their quills, up to 40 cm long, cylindrical, stout and
sharp. When alarmed the animal raises its quills and vibrates them to
produce a rattling sound, if this warning does not work, the porcupine
charges backwards with the quills directed to the rear. The quills are
lightly rooted and easily detach from the porcupine, the animal cannot
"shoot" the quills as in popular belief.
Porcupines
are nocturnal, sheltering in daylight in Burrows made by themselves or
Aardvark. They live in pairs or even small groups. They are exclusively
vegetarian, feeding on bulbs and roots scratched out of the ground, as
well as bark and fruit. They may do much damage in cultivated fields,
being wasteful feeders.
The young
- two, sometimes up to four in a litter - are born in the burrow. They
do not leave the burrow until their quills are strong and hard, after
about two weeks.

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