What did I miss?
1. Miss the eyes and you've missed the shot. Lock the focus on the eyes and take the shot, even though the rest of the area are blurry, that'll still do.
2. Don't forget your own eyes as well. Keep both your eyes open while taking the shots. This will help you to anticipate the animal's behavior. You'll get use to it if you think it's not as easy as it sounds.
3. Shutter speed: 1/500 or faster depending on the light. If you want to give sense of motion to the image, try 1/4 to 1/8 and pan your camera with the animal. Pan steady. Now remember, keep the eye focus if you can! For best results, pick backgrounds that are uncluttered and simple, as this will make the subject standout in the image.
4. Aperture: Use a wide aperture: f/3.4 for my kit lens, or f/1.8 for my prime lens.
5. Use a flash to fill in shadows, even if it's in broad daylight. This is helpful if the eyes is dark as shadow. But be careful not to scare the animals. Worst: they might run after you. LOL!
6. Shoot. Shoot. Shoot.