Have You Seen Duck? By Janet A Holmes, illustrated by Jonathan Bentley

From chapters.ca:
"Have you seen Duck? He smells like a blanket." A young boy and his soft plush pal are inseparable. But when Duck goes missing, the boy is inconsolable and goes in search of his friend. "He won't know what to do without me," he says. The boy asks the shopkeeper, the postman, the bus driver, and the dog next door. No one has seen Duck. Back at home, what's hiding between the couch cushions? Duck! A beautiful, relatable tale of coping, searching, and finding!