There are many ways Ivan and Dewey are different .For example, Dewey lives in the Library and Ivan lives in the mall. That means Dewey got adopted by a librarian and Ivan got adopted by a mall keeper.
There is another way Ivan and Dewey are different. For example Dewey is very happy has a clown and Ivan is sad.
There are lots of ways Dewey and Ivan are similar. They both were found when they were babies and they both got adopted .They like to make new friends. Another way that Ivan and Dewey are similar is that Dewey likes to entertain people and kids when they are sad and he would go to them and sit on their lap and make them happy .Ivan watches TV and draws for people and they buy his drawings to be happy.
I hope that you liked how I compare and contrasted Ivan and Dewey .I like the books because they tell about the lives and troubles of interesting animals.