What causes that honking cough in my dog — is it just something caught in the throat, or tracheal narrowing?

Quick answer

A rough 'honk, honk' sound like a goose call that keeps happening likely points to tracheal collapse — a narrowing of the airway. It tends to worsen with excitement or when a collar (leash) presses on the neck. Use a harness on walks, manage indoor humidity, and if it happens often, get an X-ray at the vet.