If you like Eragon by Christopher Paolini... then try . . .
Dragon Rider by Cornelia Funke
"A marvelous quest by a boy and two beasts to find a place for the dragons to live peacefully forever."
The Great Tree of Avalon by T.A. Barron
"Building on his Lost Years of Merlinepic (also a wonderful, historically based fantasy series), Barronproposes that, years ago, Merlin planted a magical seed that has growninto The Great Tree of Avalon-a world where all has been harmoniousuntil the recent bout of famine and disease.
The Warriors series by Erin Hunter
"In Eragon, the dragons are at risk. In Warriors, it is the clan of cats who must leave their familiar forest and find a new home."
The Redwall series by Brian Jacques
"Good versus evil in the form of a medieval adventure filled with heroic warrior mice."
Blood Red Horse by K.M. Grant (and its sequel, Green Jasper)
"A riveting historical adventure, good for adults, young adults, and perfect for families reading together."