Gerrymandering goes on in Canada also, but not to the blatant degree it goes on in the US. They don't have those odd shaped Congressional districts like that 200 mile long and 5 mile deep one on the Central California Coast, but you should see the shenanigans that goes on for a party nomination in Canada, all parties.
The best case of gerrymandering in Canada in recent memory was actually done within a party - the Tony Valeri-Sheila Copps fiasco in Hamilton. They redistributed it so that there was a strong NDP riding in Hamilton Centre, a strong Conservative riding in Niagara West-Glanbrook (rural Hamilton) and a supposedly strong Liberal riding melded out of the strongest Liberal parts of Hamilton East and Stoney Creek. It forced Sheila to leave politics, and almost cost Tony his job too (the NDP came close and the Conservatives weren't that far off either!)