My casin killed my dog, shuld i turn him in to police?

My casin ,Sang Lu was mad at me cas I owe him $25 dollar for 2 month so he came over to my back yard when i was not de home, he drown my dog chiwawa in backet of de water.. I was cryin he call me later he said we de even now bich! shuld i call police on him.. he is de femely! do.