Oh, yes, indeed, Marley and you need to be in class.
Try contacting
obed clubs in your area. My kennel club runs various training classes throut the year.
My Rottie rescue group has a listing on our site of trainers and behaviorists with whom adopters of our dogs have worked with and liked. Perhaps
Rottie rescue in your area has a similar service.
Have you asked your vet for suggestions? What about grooming salons and pet sitters?
You're correct--it's not a good thing for Marley to start running after Joey.
How about putting a line on Marley, reeling him into you while calling him in a happy tone, and making him do a fun obed routine for which he's rewarded with yummy goodies when Joey starts zooming around?