I had never seen the Landseer before... and will now never be able to unsee it. :-P A truly chilling image. I think you're right, too, that there is something more viscerally disturbing about the Landseer when compared with the Gheeraerts. Something about the way the monkey is physically dominating the cat - to the extent that when I first looked at the image, I thought it was raping her - and the cat's open-mouthed scream of agony (in the Gheeraerts, the cat just looks like it's sort of hissing).

I'm glad I don't live in a place where I'm likely to run into any monkeys going about my daily business. I think if I saw one today, it would turn out badly for both of us.