I learned something new about your boys today (and I was laughing too):  they can not tell time.  I let them outside and as soon as they peed, they came to the back door to be let in.  They both sprinted towards the laundry room and their food bowl.  It was 1:30.... not dinner time!!  I was laughing at them.  I guess they remember me and they know that after I let them out, I always feed them.  Funny!