So I faced this pet today and it used Puppies of the Flame. Thinking it was like Raggys Sons of the Flame/Turnip Sons of the Root, where it could be attacked by burrow I switched in a Bunny.
Now for Raggy/Turnip the burrowing pet still takes damage from the Sons and the Burrowing pet can hit Raggy/Turnip. But alas things have changed. Bunny took no damage from Sons(misses) and the Burrow missed as well. Only to Surface and get a superbark in the face, nice elemental critter counter.
Anyone know if this is only the new Puppies of the Flame or if it has changed raggy/turnip sons as well?