Space key or click the cat the change fur color E key or click the eye to change eye color P key or click the patterns to change the patterns(if a pink heart shows up click that for next pattern) H key or click the hat/ear accessory(if green heart shows up click that for next hat) N key or click for collars(if blue heart shows up click that for next collar)
feel free to give accessory and fur color/pattern ideas in comments
