Dogs will generally avoid lava, but they will jump into lava in order to attack a mob. I was caving and knocked a zombie into a lava pool. This caused all my dogs to jump into the lava pool to try to attack the zombie, killing all my dogs.
Comments 6
Probably intended, to avoid this issue, use a bow and arrow as this doesn't send your dogs after the zombie.
This is intended, as they go after the zombie.