McMullen, Beth, 1969- Secret of the storm (Series) #1

Cassie King's father has died, her mother has retreated into herself, away from reality, and her best friend has abandoned her for the in crowd, so when she and her sort-of friend, Joe, find a kitten during an intense electrical storm, Cassie is determined to adopt him; but Albert (named for Einstein) is no ordinary kitten: he is incredibly strong, things around him tend to burn, his eyes glow red, and when he gets annoyed the weather turns dangerous--in fact Albert is a dragon, and there is someone searching for him with very unfriendly intentions

Ages 8 to 12