That makes sense to me. But which people get to choose when to re-elect a government? I read that the Governor General was the one to call this last election. Do only certain elected officials get the power to call this or can anyone?

Technically, the Governor General calls the electuin, but in practice it's not his or her choice, unless something unusual happens. Just a rubber stamp.

If a majority of Members of Parliament vote yes on a no-confidence vote, that will trigger an election. Otherwise the prime minister chooses when an election will happen, within 5 years. If the government is a minority, it is likely it will call an election within a year or two if they're confident they could get a majority (this happened last year). Otherwise, with a majority government, they tend to wait longer before calling an election.

Gotcha, thanks for the info!