You don't!
Firstly - feeding him gunpowder is only going to make him sick ... very sick! In many places it is illegal, and certainly it would be considered as animal abuse. It will cause damage to the dogs internal organs - kidney, liver and stomach lining to say the least, and the only reason it may get aggressive is from the PAIN caused by swallowing a poisonous substance! It is messed up thinking.
Secondly - why do you want an aggressive dog?
