oh heck yes you have the right to be mad...
this is Kinda off subject but still on it
So lets say your small children and the dog we are talking about is a bigger dog let say a rottie not saying all rotties are this way but just of arguments sake we need a big dog that is very well known for being territorial
alright so you have your small children run around out side they stay in your yard and play on the swing set this dog comes and attacks your children and puts them in in the hospital.. is it your falt that thier dog came and attacked your child in your yard.. no its thiers for not being a responsable dog owner. they would be lyable for all the doctor bills and their dog would be uthinized no qestion..
i would totally tell them that they are resposable for the attack of the chickens on your property (by letter and make a copy for your records) and tell them that you will kill the dog on sight if you see it in your yard again. they are just scared that they will be blamed which they should be because they know its there falt.
i know its hard to do this i have both a dog that bolts out the door and chases my neighbors chickens and i have a neighbor with two dogs that come over and kill my chickens.
so i can see both sides of the fence but now that i know that my dog is chasing her chickens i keep a better eye on her. and with my neighbors dog i shoot them with a pellet gun when i see them. i dont let ANY DOG on my property besides my own.
good luck and remember karma will catch up with those who deniy her.
im sorry for you loss but yes you have the right to be upset any degree.
even a rubber band gun would work.
its not your falt sweetheart not one bit..
im sorry you have such nasty neighbors that always sucks.
good luck