FOMO Puppy

My girlfriend owns a 7 month old, intact Standard Poodle puppy with severe FOMO. The other dog in the household is a rescue and has been missing out on some one-on-one time since the puppy came home. When my girlfriend tries to do some training with her first dog out in the yard, the puppy loses his marbles with incessant barking that does not stop. This is the case regardless of whether he is loose in the room indoors, crated, in the catio where he can see the yard, or tethered outside. For this reason, he also can’t be left home alone when she takes the other dog for a walk.

I can very rarely visit the household to help, but ideas on how I could are welcome. He can’t be left to “cry it out” either (even though she also wouldn’t put him in this position) because of a fear of noise complaints. No one else in the household is able to watch the puppy while my girlfriend trains or goes for a walk.

My suggestions have been the relaxation protocol which I need to revisit and be able to demonstrate in person to her as well as place training so he can learn to lay on a mat outside while training of the other dog is taking place. Any advice or suggestions would be greatly appreciated.