I have 3 dogs and its really hard to leave some one behind. The 2 girls are nuts about the truck my male not so much. For a while he would choose to stay home, then all of a sudden he decided he'd rather join us and run to the gate with the girls. I definately think you could create some resentment taking the little one and leaving the other dog home. You really need to make sure you give your other dog equal time.
Apache - Shiloh Shepherd 12/15/02
Kiya - Shiloh Shepherd 5/15/04
Lakota - WGSD 1/13/10