Make sure to centralize them if you want to beat Hog Riders. In Clan Wars, Dragons are excellent troops to place in Clan Castles against Hog Riders, especially for Town Halls 8 and 9. They have high HP, meaning they won't die easily and can kill mass quantities of Hog Riders swiftly if not properly lured. Most mass Hog Rider strategies require that the enemy Clan Castle troops be killed first, so if the attacker lures out a Dragon, but fails to kill it, then a 3-star win is next to impossible, much less a 1-star win via destroying 50% of the buildings. Multi-target Inferno Towers can be a severe hindrance to Hog Riders, having high HP to take several hits from Hog Riders, while hitting large groups of them. Although the Hog Rider is certainly not a liability on defense, the fact that all defensive troops are unimpeded by Walls negates the primary advantage of the Hog Rider.