This is a good story having stuck in a pool but as the movie progress it is just bad bad bad. The dog is there for the convenience, to drop the pizza and to drop himself and die so the actor can climb with the chain the dog was hung with. Seems like they used the dog for the plot to get out of the pool but such a poor idea even though two guys came and left the ladder but still needed the dog killed for the rescue. What a poor way they thought for the main character to get out. The final fight with crocodile was enough.
They could have censored the whole process of dog dying though. They wanted to make the dog dying a BIG twist which is CHEAP. Good bye