Here's why:
* The vowel "o" is short: The "o" sound in "robin" is a short, clipped sound, like the "o" in "hot" or "dog".
* No double vowels: There are no double vowels or vowel digraphs (like "oa", "ai", etc.) that would typically indicate a long vowel sound.
* Stress on the first syllable: The stress falls on the first syllable ("rob"), which further emphasizes the short vowel sound.
Let me know if you have other words you want to analyze!