"The Keeper of Sheep" is a collection of poems by Alberto Caeiro, one of Fernando Pessoa's heteronyms, known for its simplicity and deep connection to nature. In this work, Caeiro assumes the identity of a shepherd who lives in harmony with the world around him, valuing the here and now and rejecting complex and abstract philosophies.

The collection explores themes such as the simplicity of existence, the beauty of ordinary things, and the quest for a genuine connection with nature. Caeiro describes the world with a perspective free of interpretations and symbolism, advocating for a way of life without metaphysical or religious concerns. He sees things "just as they are" and promotes a kind of freedom that comes from accepting the world in its essence, without mental impositions.

"The Keeper of Sheep" is considered a poetic manifesto of freedom and a celebration of sensory and concrete reality. The work reveals Caeiro’s view of life, where the peaceful contemplation of nature is the highest expression of wisdom and peace.