Pets and Animals: What Happens if Your Dog is Attacked by Another Dog on Your Property

My question involves personal property located in the State of: Oregon

If my neighbor's dogs come onto my property and injures my dog(s) who is at fault?

Also what if my dog injures their dog(s) - again on my property - who is at fault?

Pets and Animals: What Happens if Your Dog is Attacked by Another Dog on Your Property