From today, you can dismember the mobs of Minecraft 1.7.2 :)
Mob Dismemberment 1.7.2 and 1.7.10 that woks at the time of mob attack, generating some dismembered limbs and pixeled blood. By the moment, only zombies, creepers, skeletons and pigmans can be dismembered, just zombies will loose blood.

Detail and Download here : Mob Dismemberment Mod

Homepage: Mods for Minecraft