The Canadian dollar was little changed against the greenback on Friday as data showed bullish bets on the currency have been slashed, but the loonie posted a two-month high earlier in the session and scored its biggest yearly advance since 2009.

At 4 p.m. ET, the Canadian dollar was nearly unchanged at $1.2569 to the greenback, or 79.56 cents US. It touched its strongest level since Oct. 20 at $1.2515. 

"The U.S. dollar has been down for several sessions now and combined with oil prices at US$60 ... it has definitely pushed USD-CAD down to levels that are on the low end of where we think we'll see it go," said Don Mikolich, executive director of foreign exchange sales at CIBC Capital Markets.

The loonie has climbed seven per cent in 2017, its second straight year of gains as Canada's economy recovered following a plunge in oil prices.

U.S. oil prices have rebounded to reach their highest since mid-2015, spurred by strong demand and declining global inventories. They settled on Friday nearly one per cent higher at US$60.42 a barrel.

The U.S. dollar slipped to its lowest in more than three months against a basket of major currencies.

Domestic data before the Christmas break, which showed an acceleration in inflation and strength in retail sales, has helped underpin the loonie by increasing prospects of further interest rate hikes from the Bank of Canada. Money markets expect Canada's central bank to raise rates three times in 2018, which is more than is expected from the U.S. Federal Reserve.

"If it wasn't for NAFTA and some other shadows ... one could become a little bit more bullish on the Canadian dollar," Mikolich said.

U.S. President Donald Trump has threatened to withdraw from the North American Free Trade Agreement with Canada and Mexico if he cannot rework it in favor of the United States. Officials from the three countries will meet in Montreal from Jan. 23 to 28 for talks on thorny subjects such as autos, dispute settlement and an expiry clause.

Speculators have cut bullish bets on the Canadian dollar to the lowest since July, data from the U.S. Commodity Futures Trading Commission and Reuters calculations showed.

As of Dec. 26, net long positions had fallen to 17,346 contracts from 45,901 a week earlier. Canadian government bond prices were mixed across a steeper yield curve, with the 10-year falling nine cents to yield 2.042 per cent.