Under the firearms act - any propelled irritant is illegal. There's no % that's safe. The "dog spray" is just as illegal as bear spray. Yes police aren't cracking down.
I've gotten crap before about bear spray in the 4x4 (on big ass mud tires), because police spotted it, argued I wasn't actually on my way to a rural location it was needed. (Didn't even get in front of a judge before it was tossed)