SPCA chief executive officer Andrea Midgen said the books taught animal care and wellbeing through original stories.
She said there was a deliberate focus on farm animals because after their pets New Zealand children were most likely to interact with farm animals.
"We continue to care for around 46,000 animals that have been lost, abandoned, injured, or abused each year. This is simply not good enough and we need to do better as a country. Teaching animal care and empathy at a young age is vital to turning this around."
The goal of the series was to develop empathy towards all animals from the next generation, said Midgen.
Titles in the next tranche of books included Garry the Goat's Escape, Barney and the Sheep with No Name and Toni, the Party Pony.
The storybooks were part of the SPCA's free in-school education programme created by teachers for teachers and included classroom resources, teaching plans linked to the New Zealand Curriculum and a teachers' and students' online portal.