I guess I am getting petty, but if they don't even acknowledge the damage, I would send a bill. The mannual labour alone for repairs would be over $700 aus, so over $1000us. Okay if an animal gets out by accident once and reeks havoc its fine if the owners are truely apoligetic about it and do everything to prevent it happening again, but if it gets out, they know and don't stop it and just let it run wild, it's unlikely it just goes to your place (if you have other neighbours around), its probably raided the whole neighbourhood. Maybe follow up with pictures if you haven't sent any yet?