Billy Thunder and the Night Gate Unabridged edition

Rage Winnoway's mother has been asleep since she had a terrible accident. In a quest to find healing magic, Rage and her animal friends travel through a strange gateway to Valley, a land of mythical beasts, talking dogs and streets that change shapes. But Valley is no paradise. Harsh guardians rule a sinister black city, and fugitive witch folk work forbidden magic. Rage desperately wants to go home, but the one person who can help her, a wizard, has disappeared. Her only guides are the treacherous firecat and an enchanted hourglass...