Update: Duke and Simba have settled their initial differences and are chasing each other around the house and playing! I've not seen Duke so active and playful in years.
I have to keep an eye on things from time to time, Duke gets pretty rough with him. But the little pup takes it and doles it right back out.
In about 6 months, Simba will be getting his revenge. lol
Cool to see them getting along and playing. Duke's needed a playmate for a long time. 🙂