You’ll see Paint mode (icon with the paint palette) as the last option of those icons.
When you’re in the menu to adjust furs, ears eyes etc. This makes is easier to paint their belly, feet or tail and as a bonus: the poses look really cute. One of the great new features is that you can select a pose for your pet. With this tool you can definitely recreate your real life pets! Paint, erase or pick an existing color with the color picker on your pet and create any pet you like. You can select a color from the color wheel or you can select the default swatches. Paint spots or stripes wherever you want on your pet.
The new Create a Pet tool has endless possibilities for you to create the pet of your choice.