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;
}
}