The book Animal Pets was published by Charles E. Graham around 1880. They did not identify the artist but since the book was published over 120 years ago, it and all the wonderful illustrations it contained are in the public domain.
A saddled mule patiently awaits for his rider. This great vintage black and white image would make a great addition to your next art project with mules.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.