While being a rather rude and extremely self-absorbed wolf, as it turns out Rattus is a fantastic hunter. He has been known to eat what he catches before the pack sees it, and has had to be punished accordingly on multiple occasions, but everyone knows the behavior will continue. Frankly, the Lead Wolf has somewhat given up now that Rattus is so old. Thankfully the prey-stealing has stayed exclusive to him and hasn't spread to others in the pack. Inconsiderate as it may be, False Rattler is lucky enough to have plenty to go around.
Rattus joined the pack at a rather old age as a life-long lone wolf. Lead Wolf always considered it likely that his prey stealing comes from not being used to having other wolves to feed. Rattus has really only been a pack wolf for the last few years of his long life. Habit is a powerful force after all, and Aaron was always a rather lenient Lead Wolf.