The title of this film should more accurately be "Summer of the Apes" as chimpanzees are not in the monkey family but in the ape family.
This movie was never made by Disney it was only distributed through Disney. However this movie calls it's self A Heartwarming Adventure in the Great Disney Tradition of Old Yeller. Considering that fact that Old Yeller and this film have no connection or style to each other. And both films are based of books written by different authors. (Old Yeller Fred Gipson, Summer of the Monkeys Wilson Rawls)