If you use the installer you cannot modify your source code; however, if you actually compile your own source you can check zone/pets.cpp for Mob::MakePoweredPet and look for this: 
	Code:
	if(record.petnaming == 2)
{
	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;
	default:
		npc_type->race = WOLF;
		npc_type->texture = 0;
	}
}