The narrator is a really dynamic and round person because at first we see a loving person and he adores his pets and wife. But then he starts drinking and becomes evil and ends up killing his wife and cat.
The cat Pluto is a loving cat, and him and the narrator have a very loving relationship that lasts years, but then Pluto realizes the change in the narrator and becomes distant which then makes his owner mad. Although, Pluto gets his revenge, he dies a couple times. He is sort of a flat character though because we never really see a certain side to him considering he is a cat.
"...They saw before them the body of my wife, black with dried blood and smelling of decay." (4)
"In sudden anger, I took a knife and struck widely at the cat." (4) In this short quote you get antsy because you don't know what the wife is going to do considering she is right by him.
The narrator says as the police arrive, ""The walls of this building" I said, "are very well built, it is a fine old house." The narrator clearly knows that the walls in his house weren't well built because he hid his wife in them just by removing the bricks, but he still tried to lie to to police.
This story has a suspenseful and dark mood to it, that is created while Edgar goes into detail when the narrator spills the blood of his wife and cats. It is also created once the police find the body of the wife in the walls when he explains the dried blood and smelling of decay.