Milo is a big white dog who finds a deep puddle after the rain, rolls in it until he is brown from nose to tail, and comes inside to a bath he does not want. The last line, where he goes straight back out and finds the puddle again the next day, is the one that gets a laugh and makes the reread easy to ask for.
This is the second timed passage in the set and it is built to the same shape as Sam’s Loose Tooth, 106 words with the count running down the margin and a three-row chart at the bottom. Having two at the same length is deliberate: once a child has a score on one, the other gives you a clean comparison a few days later without the passage being familiar. Run them a week apart rather than back to back.