Questions & Answers about Mi perro gordito duerme en el sofá cómodo.
Both come from the adjective gordo (fat/chubby).
- gordo = fat, chubby (can sound neutral or a bit blunt depending on tone/context)
- gordito = diminutive of gordo, often more affectionate: chubby, a bit fat, my chunky little…
In the sentence, mi perro gordito suggests affection, like my chubby little dog or my chubby dog said lovingly, not insultingly. Diminutives in Spanish are very commonly used to soften or show affection: gordito, perrito, casita, abuelita, etc.