Amy Wild, Animal Talker: The Secret Necklace by Diana Kimpton

When Amy Wild goes to live at her great-aunt's tea room on the island of Clamerkin, Granty, her great aunt, welcomes her with a very special necklace - a necklace that gives Amy the power to talk to animals. Granty's terrier, Hilton, introduces Amy to the Clan - a group of animals whose job is to protect the island.