Just add it to the switch like this (change ID to the race ID and TEXTURE to the texture you want): 
	Code:
	switch(GetBaseRace())
{
    case VAHSHIR:
        npc_type->race = TIGER;
        npc_type->size *= 0.8f;
        break;
    case TROLL:
        npc_type->race = ALLIGATOR;
        npc_type->size *= 2.5f;
        break;
    case OGRE:
        npc_type->race = BEAR;
        npc_type->texture = 3;
        npc_type->gender = 2;
        break;
    case BARBARIAN:
        npc_type->race = WOLF;
        npc_type->texture = 2;
        break;
    case IKSAR:
        npc_type->race = WOLF;
        npc_type->texture = 0;
        npc_type->gender = 1;
        npc_type->size *= 2.0f;
        npc_type->luclinface = 0;
        break;
    case WOOD_ELF:
        npc_type->race = ID;
        npc_type->texture = TEXTURE;
        break;
    default:
        npc_type->race = WOLF;
        npc_type->texture = 0;
}