somebody poisoned the dog you treated as your friend- would you seek revenge?

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this dog isn't your pet but a stray dog. you gave it a name and he loves you, following you almost everywhere. when you were away, you had a negative intuition and upon coming back, you just found out that he was gone and worse, had been poisoned. would you seek revenge? what would you do if you found out the culprit of the poor dog's death? please let me hear your views. thank you.