Thorns is weakened by the ability shield. Therefore, having a monster with shield on the front line is best defense against thorns on a melee only rule set. This is what Harklaw is great for! Watch the battle link and see.
https://splinterlands.com?p=battle&id=sl_061747a4728a1f54f51574f36bfb9f45&ref=fortheloveofsl