im not too sure how you go about doing this so here goes: (sorry if it doesnt make sense)

im a full british citizen and i want to go and do work experince in canada in about 2 years time (im in college at the moment), for maybe a month or so. do i need a permit if its voluntary? (planning veterinary/animal work exp)
also,
my grandma is a canadian citizen (born in canada, living in england) and my grandad (on other side of family) lives in canada with canadian citizenship, so i (assume) i can get a dual passport, if this the case, would i still need a visa? and which would be easier?

thank you! :D