Here's why:
* Short vowels are typically represented by the sounds in words like "cat," "bed," and "dog." These sounds are quick and sharp.
* "Blew" has a long vowel sound. The "u" in "blew" has the same sound as the "u" in "flute" or "rule." It's a long, drawn-out sound.
Therefore, "blew" does not have a short vowel sound.