Beasts of Olympus -Steeds of the Gods #3 by Lucy Coats illustrated by Brett Bean

Pandemonius, the son of Pan, cares for the animals at Mount Olympus' stable.  Then Poseidon asks him to care for his Hippocamps who are ill.  During his visit in the ocean, Pandemonius meets a new friend, Eunice who longs to care for the Hippocamps instead of brushing Amphitrite's hair.  Impressed with Pandemonius' care, Poseidon demands that he train his Hippocamps for a race versus Helios' horses.
Then Helios approaches Pandemonius for help too.  How can he please both gods at the same time?
Warning: The author refers to Pandemonius as "Demon" throughout the entire book.  It really bothered me as I read it.  He was not a demon working for Hades but just reading the name "Demon" left me unsettled.  Pandemonius also uses a special mixture to help the horses run faster- a bit of cheating?  Words like "stupid" and "brat" are utilized throughout the story.
*Borrowed from a teacher.
This is the 3rd book in the series.
Guided Reading Level: Q (beginning 4th grade)
Grade Level Equivalent: 5.5