I tried doing catapults to attack it so I could start up a hound farm but instead I couldn't make it work. Usually it goes like catapults can't damage the houndius so it would do same thing like to chester - keep trying to attack the creature but can't kill it.
The issue with houndius is though that from what tutorial I could find shown is that you need 4 consecutive attacks to make the agro, but it was changed and can't be done anymore 
This is more of a request to have it changed cause I placed a houndius already and there is no way to undo when it's placed so... Klei help pls xd