that reads like a horror novel in its escalation
first the chemical waste goes into the bayou
then the dogs get into it, two hours later they have to be shot
then you get the horses (an ominous sign if i ever heard one)
sewage hits yard so it's getting to people now, causing them to go crazy (hitting girlfriend)
then the german shepherd tries to attack people who hole up in a stop and shop
then the uncle going mad and trying to kill our heroes.
it's all very cinematic