One of the biggest perks of trading with a Canadian forex broker is the Canadian Investor Protection Fund (CIPF), which insures every trader's account for up to $1 million against suffering losses due to an insolvent broker. See a list of all CIPF members here. Furthermore, all brokers in the country must be registered with the Investment Industry Regulatory Organization of Canada (IIROC).
Depending on the province, where they are registered, brokers in Canada may need to comply with different regulations – Quebec and Ontario, for example, impose additional requrements on forex and CFD brokers (nothing too harsh, though). Unlike the United States, Canada does not ban hedging, there is no FIFO (firs-in-first-out) rule for closing positions, and leverage is not restricted.
Despite being a vast country, Canada is not particularly popular destination for forex brokers; one of the reasons for this is that Canadian citizens are not mandated to trade with nationally-licensed brokers only and can trade with pretty much any brokerage from any country.
* InvestTechFX and Fx Clearing claim to be Canadian forex brokers, but they are not CIPF members.