If you like the Animal Ark series, here are some titles that you might enjoy:
Shiloh by Phyllis Reynolds Naylor.
When he finds a lost beagle in the hills behind his West Virginia home, Marty tries to hide it from his family and the dog's real owner, a mean-spirited man known to shoot deer out of season and to mistreat his dogs.
Charlotte's Web by E.B. White.
When he discovers that he is destined to become someone's dinner, Wilbur the pig is dissolute until his spider friend Charlotte decides to help him.
If you like the Dragon Slayer's Academy series by Kate McMullan, here are some other dragon/fantasy books you may enjoy:
Three Tales of my Father's Dragon by Ruth Stiles Gannett.
My Father's Dragon -- Elmer and the Dragon -- The Dragons of Blueland.
A compilation of three tales which relate the fantastic adventures of
Elmer Elevator and a baby flying dragon named Boris.
If you liked Fancy Nancy by Jane O'Connor, here are some other titles I hope you will like just as much:
Fancy Nancy and the Posh Puppy by Jane O'Connor.
Nancy wants to adopt a special puppy so that she is no longer the only fancy member of her family, but after a day of puppysitting a papillon, she realizes that being fancy is not always the most important thing.
Annie and Snowball and the Dress-up Birthday : the first book of their adventures / Cynthia Rylant.