TORONTO (Reuters) - The Canadian dollar looks set to extend a rally that's taken it to 3-1/2 year highs against the U.S. dollar this week, as more hawkish Bank of Canada comments lifted the currency and global investors pushed into the safety of Canadian assets. Given the central bank's clear signal it would likely resume interest rate hikes later this year, analysts said the currency might even revisit its modern-day high. It reached C$0.9059 to the U.S. dollar, or US$1.1039, in November 2007, according to Thomson Reuters dealing data. "Yes, Canada could hit post-Civil War highs once again," said Michael Woolfolk, a senior currency strategist at BNY Mellon in New York. "(Hitting the high) would not be altogether unwarranted if Canada begins raising interest rates again. It's certainly not in our forecasts, but it's a nontrivial possibility of hitting C$0.90 within the next 12 months." Based on available data, the Canadian dollar was at an al...