BF feeding him, walking him, good start. Can they play a bit together too? Maybe BF can start teaching his commands (sit, lie down) so he is getting treats now and then.

Any idea what breed Otto is? Some breeds do develop a loyalty to one person, but once you are gone (work, etc) he should be OK with BF.

Although, as I write this: Dad says when I leave for grocery shopping, he could swear there isn't a dog in the house! They all go to sleep someplace. None of this "I am on the wrong side of the door" Grand Central Station as they trek in and out, no toys tossed to him to get attention. This IS a bichon trait, though. They tend to lock on to one person.

If Dad goes to sit in the backyard and calls, they will go with him. BUt there is not the mad dash to the door to be with him at all costs, as when I go to the door.