Barry Ritholz highlights the alarming debt to income ratio for Canada compared to the USA:
Household Debt to Income ratio

How does Australia compare?
Australian Household Debt to Income ratio
Australian household debt to income is similar to Canada’s. There has been discussion recently about whether Australia is in a housing bubble. As Anna Schwartz (joint author of A Monetary History of the United States, 1867-1960 with Milton Friedman) pointed out: there is only one kind of bubble and that is a debt bubble. It may manifest through rising real estate, stock or other asset prices, but the underlying driver is the same: a rapid expansion of the money supply through easy credit.