For the younger child especially, Dogzilla is more accessible. My 20-month-old daughter has loved that one since 13 months (with minor abridgement) and she likes to look at this too but it is a little over her head.
Cute story, imaginative photo illustrations. Most children enjoy this book, but have had some who were upset by the cat being used as Kong and being in chains.
This is a funny children's book based, of course, on King Kong. My children loved it.