The Red Tiger is a Tree dragon that appeared in How to Steal a Dragon's Sword.
There is no description, but based on the name, Red Tigers may be red with stripes. Their eggs are shown in The Incomplete Book of Dragons and have a red color.
The Incomplete Book of Dragons relates that Red Tigers are very fast and can speak Dragonese.
Red Tigers are Riding dragons for Vikings as seen in How to Steal a Dragon's Sword.
Red Tigers also sided with humans during the Dragon Rebellion.
Red Tigers are the mounts for Flashburn and his band of warriors.
A picture of an egg shown in this reference book is the only image available for the Red Tiger. They are also listed in the 'Dragon Key' at the back of the book.