What condition does Enzo have?

Enzo, the protagonist dog in "The Art of Racing in the Rain," is depicted as having hip dysplasia. This condition is a common genetic disorder in dogs where the hip joint doesn’t fit properly into the hip socket, leading to pain and mobility issues. Throughout the story, Enzo experiences significant discomfort and limitations due to this condition, which affects his quality of life and emphasizes themes of loyalty and perseverance in the narrative. His struggles with hip dysplasia serve as a metaphor for the challenges faced by the human characters, illustrating the connection between Enzo's experiences and the broader emotional landscape of the story.

The other conditions listed, while serious, do not align with Enzo's character or the narrative's focus on his particular struggles and resilience.