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Clare Bell
Clare Bell is a British author in the United States best known for her Ratha series of young adult fantasy novels about prehistoric big cats. These books, also called the Named series, are about intelligent self-aware large cats who have puma, cheetah and lion characteristics, and are based on fossil creatures who are ancestors of the saber-tooth cat.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

Ratha and Thistle-Chaser
1990
ISBN 9780689504624
Ratha and Thistle Chaser Named Book 3
2012
ISBN 9780575126022