The Sentinel

Even though both of the girls can, and do, push Luigi around at times (particularly at mealtime, of course), he is vigilant in checking out strange noises, critters, or other activities in their vicinity. Here you'll see all three paying close attention while Rick was making some adjustments to a trailer hitched to his truck.

After a couple of minutes, the girls lost interest and walked over to see what I was doing a few feet away.  But Luigi stayed vigilant, continuing to check things out.

I'm glad to see he takes his job as protector of the herd seriously.