It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Monkey trainer and dog. Monkey trainer and dog Print shows an old man carrying monkey on his back and dog barking at the monkey Color woodcut Library of Congress loc gov pnp Creator Shibata Zeshin Reduced size compressed version version of File Monkey trainer and dog tif PDJapan Shibata Zeshin paintings
Page 2017 Free-images.com. All images are Public Domain