@azygous My husband is the strong pack leader. I'm more of the pushover with dogs. He is working on training already this morning.
It is hard to believe that an expensive dog like this one hasn't been taught any basic commands.
He is house trained. He seems to have a very low prey drive (if any) so there is hope. He barely glanced at the hens that were flying towards us,squawking for treats, when I took him out this morning.
@chicken1234 Ruby has an appointment this week for a full health check. She had a vet check last month for a follow up on a scratched eye. All was good then, so I'm pretty sure she is mourning Dexter. I wish my husband would have given her (& me) more time before adding another dog but he is mourning in his own way.
Bruce has an appointment on Thursday for a full check and to schedule his operation.
Thank you both for replying. I'm a little more optimistic this morning.

after all, Ruby hated Boo when we adopted her.