About eight years ago, I was working at night in a factory. Around six o'clock me and one colleague left the factory to go to his appartement that was a few streets farther. when we reached a railroad underpass, we saw a dog, german shepherd, far away on the sidewalk in front of us. It was running in our direction barking at apparently us. So my colleague told me "you have to show it that you are the master..." or something like that (in french canadian). When the dog reached us my colleague used his lunch box to distract it, which was turning around him all excited. And then out of nowhere, a second german shepherd, bigger then the first one showed up from a bush behind the underpass growling at me. At the split second when it was just jumping on me I had the reflex to kick it on the muzzle. I gave it a sort of mawashi geri but with the heel instead of the top of the foot. It was like kicking on a sand bag but it stopped its jumping maneuver. And then after that I ran away by zigzagging in the street in the hope that the vehicles would interfere with the dog (the rush hours were just starting) and it worked. One of the dogs apparently had been hit by a car since it was limping later. So the two dogs started to bark after the cars when the light of the intersection turned red. It allowed us to run away. We then reached a payphone and called the police. They took about 30 min to one hour to control them. They would stay in their car using long perches with a lasso at one end. It was two guard dogs escaped from the yard of a car lot or garage or something with big fences. Today I'm wondering if I had some pepper spray on my belt, would it have worked? I was lucky that day cause I could have missed it. My questions are:

1. would this product be effective and relied upon (a paltry half a percent of OC I think...)?
http://www.fcsurplus.ca/shopping/shopexd.asp?id=3248
or this one:
http://www.macecanada.com/canada/product/sabre.htm

2. would it be inconspicuous enough to have it in a holster on your belt (it would be useless to have it in your backpack)?

3. what is the difference between Capsicum and Capsaicin?

4. Does anyone know by any chance what are the alternatives and if I can buy some 10% OC legally in Canada?

5. Can I know how much capcinoids these products have?

Thanks in advance.