Sometime it can't be helped, especially when there is another
vehicle adjacent slightly infront, and the animal missed that
vehicle only to be hit by you travelling behind.
But on a straight and clear road, accidents with animals can be
avoided, the driver really heed ot look ahead at all times. Most
drivers just half glance the road infront and just go ahead. These
drivers you can see always get caught behind a stationary lorry or
bus because they don't look out well ahead enough to
take evasive action. Usually they fail to see the animal and
even pedestrians, at the side of the road about to cross until too
late. Even then they horn first instead of lightly braking.
Sometimes slowing down slightly will give sufficient time for the
animal to run across. But they must be spotted first well ahead and
anticipated by a "what if" that animal, or pedestrian, suddenly run
across.
It may be only a cat or a dog, but the feeling is not good. For
most people anyway. Some people will feel heng
ah, it is a cat, and not a pedestrian.