What did Enzo refer to Maxwell and Trish as?

Enzo, the narrator of "The Art of Racing in the Rain," refers to the characters Maxwell and Trish as "The Twins." This nickname reflects their close relationship and mirrored personalities, both in their interactions with each other and their shared experiences throughout the story. It highlights the familial bond and the dynamic they have, which is observed from Enzo's perspective as a dog. Their connection is an essential part of the story, emphasizing themes of companionship and loyalty, which are central to Enzo's narrative.

The other options, such as referring to them as "The Couple" or "The Friends," do not capture the specific nuances of Enzo's perspective and the underlying themes of duality and connection in their relationship. Similarly, calling them "The Neighbors" lacks the depth and emotional resonance that "The Twins" conveys, as it does not reflect the intimate bond Enzo observes between them.