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I might recommend that you examine the regulations which India/other countries have enacted regarding chemical self-defense weapons. While I have limited experience with them, they seem to have similar designs/safety features which will give you an idea on the complexities others have encountered when designing chemical self-defense weapons. (It is my understanding that when a jurisdiction bans chemical self-defense weapons such as pepper spray, it's because of situations in which the weapon was used against a victim/failed in a way in which a victim was overpowered.)

If you find during prototyping that the bangle doesn't work as a chemical self-defense weapon, I would suggest taking this idea and going in the direction of tagging the attacker (I know of three ideas here that propose this: )

You can use a red indelible ink to do the tagging, which still seems to cover the spirit of your idea. I have entertained the idea of using the same purple ink used in elections here in India (also suggested by another commenter) but I suspect that it's best to stay away from the purple, as people can disenfranchise others if they have access to it.

There are definitely some local animal welfare NGOs here and there...even here in rural South Goa there is one. But truthfully I don't think that it requires all that much sophisticated training to get the dogs to try walking people home.

The incentive for the dogs? Perhaps a few dogs are trying to get adopted, but I am sincerely given the impression that the dogs have a natural sense of duty and get happiness from performing those duties.

Yeah this is one area in which I am hoping that the ecosystem adjusts to where the demand is needed.