Just like in any other parts of the country there are a few dangerous animals that you might encounter on your visit to Cambodia.
However the really dangerous animals would likely be in the really remote areas of Cambodia and not in the more populated areas.
I never encountered any dangerous animals in my visit to Cambodia a few years ago but just be aware of your surroundings and you should be fine.
There are some other animals in Cambodia and some venomous snakes.
Cormorants, cranes, ibises, parrots, green peafowl, pheasants, and wild ducks are also found in Cambodia, and species of venomous snakes and constrictors are numerous in Cambodia.