The general color scheme of the movie's world is greens and light purples. Sally the rules stickler is clearly dressed in the colors of the world, showing her obsession with conformation and following rules. However, there are two large human exceptions to this rule. Conrad, who rebelliously wears bright orange which clashes and throws off the coloration of the rest of his world. But, more subtly, his mother wears a frosty pink, showing that while she Is able to blend in with the rest of the world and be a hardworking mother, she shares some of her son's more rebellious traits and doesn't wholly conform.
If the existence of the non-anthropomorphic Nevins (as well as the other dog named Frank beside him during the scene where the Cat scares him away) implies the existence of regular cats and dogs in the film's universe, how would a small, regular house cat react if it saw a giant, talking humanoid cat wearing a hat?