Structural pattern of writing essay

My dog sleeps beside my bed he wakes me up in the middle of the night to let him out. complete, run-on sentence or comma splice

What is the effect of narrator's word choice on the tone of this passage? the words "my heart shrank within itself" create a fearful tone. the words "better-omened" set a hopeful tone. the words "wounded his fellow" develop a remorseful tone. the words "struck harsh upon my ears" suggest an irritated tone.

What about the sentence structure in this passage build suspense