Aw, i am so sorry.
Are you sure it was the dog? even if it was i agree with the others it's just a dog being a dog, my dogs are all raised with other animals so are my horses but i make no mistake i don't allow the dogs in with the horses, i don't leave the rabbits loose with the dogs and the dogs and the ducks may adore each other through the fencing(there housed right beside my dog yard) but i won't chance them being together.. the dogs can be rough and unintentionally kill one of them just like the horses could kick and kill a dog.