Spanish · Pronunciation Guide
PEH-roh — a single tapped r, which is what keeps it apart from "perro" (dog).
Two syllables: PE-ro, stressed on the first, straight from the default rule for a vowel-final word. This is the textbook minimal pair for the Spanish r contrast: "pero" with a tap means but, "perro" with a trill means dog. Nothing but the length of that one consonant separates them.
Listen: pero
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Es bonito, pero pequeño.
It's nice, but small.
Listen: Es bonito, pero pequeño.
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"Es bonito, pero pequeño" uses the conjunction to link two adjectives, and both of them end in the same pure "oh" that English wants to reduce. "Pequeño" has a silent u after its q and an ñ that must be one fused sound. Say the sentence and you get three unaspirated p's in a row.
English speakers use their own r, which bunches the tongue backward, and the result sits ambiguously between "pero" and "perro" — neither clearly one nor the other. A single forward flick fixes it. The p also wants an English puff. And in writing, dropping or doubling that r is a mistake that changes the sentence completely.