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Using your arguments, you cannot say that your pet dog wants, or feels as we do. Just because they have reactions, does not mean they "think" the stimulous is negative eh? Who knows if animals do really think and feel in that case... Apples and oranges man...
Again, this is wrong. A dog can feel pain (has a nervous system), can think (somewhat...not sentient, but capable of making choices) and can cognizantly react. Put two dogs in the same situation, and they will react differently, depending on their own experiences, how they were raised, etc. Put two plants in the same situation, and the only difference in reaction comes from genes.
Again, feeling and cognizantly reacting is a fine line. Killing a fly is nothing, because a fly is more or less about as alive as a piece of grass - it has no concept of being alive. Humans do, as well as certain types of animals.