Upon hearing of Harrybo's Grandfather's death, Dave commented that his hamster also died. His classmates responded by shushing him.
He was one of the 43 kids to die of asphyxiation due to the strict teacher's no-breathing rule. Michael probably did not like Dave, as when he noticed his corpse when leaving the classroom, he laughed and remarked "Hard luck, Dave. Always knew you were a bit weak!"
Dave is not related to David Alexander from "The Outing", as David Alexander is from a field trip that an adult Michael Rosen attended, and Dave is from when Mike was a kid.