So I'm almost 100% positive that the 3% chance to summon fetish and the 5% chance to summon a zombie dog are not working. It was working in act 4 normal but now in act 1 nightmare I'm almost positive its not working.
Sounds interesting. The chances of not spawning a fetish or dog after killing 85 monsters is less than 0.1%, so if you've killed anywhere near that many then you have a good case against it. Also, are you sure you couldn't just have missed them spawning and they died too quickly in the meantime?