It might be about the perambulations of his dog
Or of his thoughts (not the dog’s)
About a particular style of jazz
Perhaps it deals with the big questions:
Love, death or the way trees
Appear to be waving goodbye
Or even hello
In any case
His logic carries me along
Until he pulls the old switcheroo
And the dog wanders off
To play clarinet with Woody Herman
And the New Thundering Herd
Let the waters come... 
That’s part of Billy Collins’ appeal, yes?
Yes, he always has interesting twists to his poems. They don’t always go where you think they are.