If you mean how they were created in Narnia, you can read The Magician's Nephew. If you mean how they were created in "real life," centaurs are from Greek mythology. Dwarf used to be a slur for little people but I believe there is a race of creatures called dwarfs in Norse mythology which is more similar to how they are portrayed in Narnia.

If you want pictures of the Narnian versions of these kinds of creatures, most copies of the books are illustrated. If you want pictures of other versions, I would suggest google. Or if you live near a library, ask a librarian.

Out of curiosity, have you read the books? Because I feel like answers to most of the questions you ask could be found just by reading them. They aren't hard books to read.

I read them and I´m reading hem. What i mean about animals, it is that when you watch a tv serie there is a biogarphy of the person(build of the person). There are things that sometimes doesn´t appear on the TV serie but it is important to know about their past.

I finished reading the magician's nephew this week. I read the creation but i would like to know if there is something specific about centaurs or other animals. Other books that explain to me different things about this group of animals or other groups.

Dwarf used to be a slur for little people but I believe there is a race of creatures called dwarfs in Norse mythology which is more similar to how they are portrayed in Narnia.

As a member of a couple of organisations that support people with dwarfism, I can assure you that the word 'dwarf' is still okay, although 'person with dwarfism' is probably the best. The word that is generally considered offensive now is [midget] so if you hear it please tell the user that it's not okay.

In fairy tales and modern fantasy, dwarfs are a separate race, like goblins or elves. In Tolkien and his imitators, the plural is [dwarves], but it is not correct elsewhere.
The mythologies of Europe include various small peoples, some with magic power and others with evil intent.

Talking cats 

the cats in narnia can talk if they fallow aslan 

im one of them aslan caled me his own

the dumb beasts can talk