Should an animal be put to death for killing human?

Now, tiger are wild and never ment to be in the same habitat as humans, dont care if you raise them since they are cub. That wild instinct is there, what happen to seigfrid. Also, dogs, if a dog attack somebody and bites him/her, then the dog should be put to sleep, I disagree, theyre pet, so the responsibility fall on the owner, regarless. What Im trying yo say is, NO, animals should not be put to death for their "wrong" doing. Another thing, bird, dogs, cats, horses, pigs, tiger, lions, elephants, although some arw domisticated and some are wild, they do have feeling. Come on, you are going to tell me that when you come back from work, and you open the door, that dog you have is happy to see you, or when you punish him, it lets you know he is sorry, or smiles when you play with him. They are not soul-less animals and its not even smart to compare them to cockroaches or mosquito because, really, that doesnt even make sense.