These deadbeat local pricks keep taunting my dogs

They're about 18 and I'm not sure where they live, but its close. They look like they're parents were brother and sister... you know, like down syndrome didn't miss them by much.
I caught them throwing rocks and lumps of wood at my dogs over the fence this afternoon. Confronted them and they started ranting bout how the dogs bark. No sh!t man, they stand in front of the dogs and yell at them and throw stuff

I called the cops to register it, but they can't do much.
These morons have been doing this for about a year. Today I just happened to catch them. And the less evolved looking one threatened to poision my dogs. Arrrgh.
Lucky I live on about an acre. I'll put up a cheap fence tomorrow morning to keep the dogs off the road frontage by 30m for their own safety. But this makes me sad. You work hard to buy land and live right. All my sh!t I've slaved for. But there's always some no hope brain dead little f&ck out there trying to tear you down

And if these little faggots were struck by lightning there'd be 2 more dumb hoodrats ready to take their place.