Help insane Neighbor might hurt me or my child!?

the man next door is a manic he has this giant german Shepherd barking all day and even after i started poisoning its food the damn thing still won't shut up today was the last straw my son was playing outside when the dog started barking at him my poor child ran to me and said " mommy i'm scared of the evil monster " so I grab my shovel and pounded that worthless soulless devil dogs skull into the dirt until it looked like a truck drove over its head with its tongue sticking out. the mans just come home so am i in my rights his stupid mutt scared my child his also a racist i think because his for ireland or one of those FOB places