This is a vintage-style illustration depicting a comical scene. A brown monkey, dressed in a red Santa hat and wearing spectacles, is playfully 'performing surgery' on a tabby cat. The cat is lying on its back on a patterned rug, looking up with wide, surprised eyes and bared teeth. The monkey is holding various tools and appears to be examining the cat's belly. In the background, a large, dark chair is partially visible, suggesting an indoor setting. The style of the illustration is reminiscent of 19th-century prints, with detailed linework and a slightly grainy texture.