A dogs reaction to pepper spray depends on the specific dog and motivation.

As for Blast's rottwieler encounter, I wasn't there to see the dogs posture, but two rotties would not be stopped by a stick if they were motivated. IMO they were posturing and being very defensive for their person. While these rotties were very protective and may in fact be good dogs, the owner doesn't have anything close to an adequate level of control. Any dog in the rottweiler class that is walked off leash needs to be fully and reliably trained. The fact that she needed to physically pull them away tells me those dogs have no business being off leash in public. They probably need to be socialized with people other than their owner and the owner needs to learn how to control them.

That said, years back I encountered a couple German Shepherds in my back yard. These two dogs had done the barking snarling thing to a female neighbor and while I like GSD's, these two were potentially dangerous. I called LE, explained the situation and the dog's rep, and asked them if they wanted to handle it or would they like me to shoot them ("No, don't shoot them"). Animal control took care of it.

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Better is the Enemy of Good Enough.
Okay, what’s your point??