The author continues:

We approached cautiously, not knowing whether this was a domesticated or wild dog. Either way, we couldn’t leave it there in the freezing water. It was completely exhausted from its attempts to struggle out of the deep section it had fallen into, and there’s no way it would’ve survived the night. We erred on the side of caution and armed ourselves with a BFS (big f*cking stick), just in case it wanted to defend itself when we pulled it out of the water. We gently looped a rope around its head/shoulders, and with a slight struggle, dragged it out onto the rocks. The dog wasn’t aggressive at all, and in fact very timidly lumbered away from us, up the bank and into the thick lantana beside the pool. As it turned away from us, we saw that she was a desexed female – at some stage she must’ve been domesticated.