yesterday i at my house garden (corner house)

suddenly a fast moving van(freen colour with logo a side) stopped ,and many malay guy came down,
and a gun blast sound , then a dog squeking sound ,
i saw one long gun sniper (hunt animal one) if not mistaken ,
but not blood,the dog turn upside down,leg came up, but no blood,
it is sleeping bullet , or they killed the dog,can i report them?
and are they from spca ?