I Finished the Nothin But a Hound Quest for Rex and i told him to go to my Lucky 38 Suite and i Can't find him:( has anybody else had this problem

yeah i had this problem when you tell too many people to go there, but i'm consle so i can't do anything but go to a different save. I tend to do that before finishing quests incase it screws up

Try the plant vault (I can't remember the number sowwy) fix the elevator and take it to floor 5 until Rex reappears (may not come back straight away)

Did you checks the King's School of Impersonation? Sometimes he'll go back there if he's been hanging around your Lucky 38 suite for a while.