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The Book of Night with Moon (1997)
by Diane Duane (Author)
Amazon.com Product Description (ISBN 0446606332, Mass Market Paperback)Rhiow seems a perfectly ordinary New York City cat. Or so her humans think -- but she is much more than she appears. With her partners Saash and Urruah, she collaborates with human wizards to protect the earth from dark forces and maintain the network of magical gateways that connect to different realities. But amid this amazing secret animal world lies a danger that threatens not only the cats of the world, but humans as well.
(retrieved from Amazon Mon, 30 Sep 2013 13:29:28 -0400)
In New York, cats race to close a gateway to another world, from where dinosaurs are planning an invasion of Earth. The cats are members of an intelligent civilization which has its own language and the novel compares their culture with that of humans.