In my article of 15 April 2010 entitled My bunyip has broken a leg [display], I explained that temperature variations had split a stone that has been lying in front of the house for ages. But this fracture hasn't prevented my bunyip from persevering in its protection of lizards, much to the disgust of Sophia.
I'm always amazed to realize that the dog's sense of smell is sufficient to inform her whether or not there's a lizard hiding behind the bunyip. A universe in which even tiny lizards have a distinctive odor must be a fabulous place.
After waiting impatiently for the lizard to reappear (which it never does, because I would suppose that the reptile senses the presence of a predator), Sophia resorts to barking… which provides the lizard with an additional motivation to lie low. At that stage, to break the vicious circle, I often intervene by moving the bunyip a little, which gives the lizard an opportunity of dashing to a more tranquil shelter. Sometimes, though, the lizard makes the fatal mistake of moving too close to Sophia, who instantly breaks the reptile's spine.