You can place Spring Traps in between defensive buildings to take out a few Hog Riders at a time; good usage of multiple Spring Traps can severely hinder a Hog Rider rush. Hog Riders can be easily killed using "forced pathing". Forced pathing is a strategy that manipulates the Hog Rider AI and makes them go to at least 2 defenses that cannot be prevented by surgical dropping or side clearing. Placing a set of Giant Bombs in between the two can most certainly hinder the attacker progress. They would not be able to heal the Hog Riders in time. Clan Castle troops, Heroes, and Skeleton Traps set to Ground Mode can be an annoyance to mass Hog Rider raids, as Hog Riders will not attack them unless all defenses have been destroyed.