Loki — Because (I assume) he is a light-eyed cat, he hates the flash more than ordinarily. And he seems to be able to tell when a camera is set to use one, whether by seeing the autofocus laser or by hearing the flash’s capacitor charging. When he does, he closes his eyes. Which solves the redeye problem. It took me about a year using the Coolpix to learn to shoot him in good light so the flash was not necessary. This situation is improved even more since I started using the Lumia for more-to-most of my cat shots, because of its brilliant use of existing light.
(Marginally related anecdote: my teacher at the Nikon School used to say that “available light” is a nonsense term. As he put it, if you have a flash in your pocket, that’s available. And “natural” light forecloses situations indoors when there is only artificial light. He preferred (and passed that preference to me) to say, “Existing light.” Meaning that the photographer is not intending to change the light, no matter its source, or how it falls, taking it as he finds it and making the best image possible given that.)