I was thinking about Koji when he was a puppy when I read your post. Sounds almost the same, except he's sorta just as bad as a 4yo. So, to help with the food issue......
Someone else wrote, "use it against LB". Seriously, best advice ever. Make him work for his food (NILIF). Use those toys that dispense food. You can just stick him in an xpen. Use the Premack Principle. It works wonders for food hounds. "Premack’s Principle states an animal will perform an undesired behavior in order to engage in a desirable behavior." Koji will hold his stay for 15 minutes if he knows dinner is following. I would suggest feeding Claussen first while LB sit's and waits. You can treat him while he waits. And/or train LB when Claussen is eating. You can work on anything, obedience, tricks, etc.
If you choose to continue feeding them both in crates. I would allow Claussen to finish, let him out of his crate. Take the bowl out so LB sees you. Then, make LB sit and wait for you to open the door. Make him learn to stay in there until he is released (crate games). If he runs over to Claussen's crate, it's okay. Food is gone. He'll probably do this the rest of his life.
As for the barking. A trainer recently said something to me that I never thought about. A lot of times, we want our dogs to stop barking, stop growling, etc. It's basically us telling them not to "talk" to us in anyway, and that's not good. So, it's okay that LB barks, BUT he needs to learn to stop. Or learn to calm down. I think someone suggested crate games. I'm told that works wonders. I haven't tried it myself though.
Also, why is LB barking at the shepherds? Is he fearful? Does he want to play? Is he being aggressive? My trainer who's helping me with Koji's barking/lunging/etc said he's afraid, but doesn't know how to handle it, and this is what he knows. Popping the collar does nothing but make it worse as you're actually making their current level of unease rise. There's many different ways to handle this. You have to decide what works for you. But it's best if you first understand why LB is acting the way he is.
Hope some of that helped. And trust me, although at 6 months he's probably in that rebellion stage, in that same breath, take care of this now. You do NOT want a 4yo, like Koji, doing the same things. It's dang embarrassing.
Oh, as for the other dogs, have you thought of walking with a stick to keep them at a distance? And definitely do not allow LB off-leash and running at them. If the other dog attacks or if the owner smacks LB with a stick....you do realize its LB's and your fault, right? Until he's in control 100%, I wouldn't allow him off-leash outside ever. Keep him safe from himself. Koji may never hurt a person or dog, but I"m sure one day, an owner or dog will retaliate.
Good luck!!! Now go hug that cute puppy of yours!
Well, here's the thing, LB doesn't just bark when he's out there. If he's barking, he's running. If there is something down in the parking lot, he's running back and forth along my lawn barking and it seems he's being dominant and protective of "his territory". With the shepherds, if they come outside, LB runs right up to them, bouncing 3 feet up and barking with every hop. Once they turn towards him and move in on him, he runs to me ears back in fear. After my neighbor calls his dogs back over, LB does this "YEAH, you run! That's what I thought!" bark and the dogs turn back towards him, and then LB looks to me for help again, or runs inside. I don't know if he's taunting them or what.
It's gotten to the point where when he is let out to potty, he bolts, running around frantically barking his head off and LOOKING for something to be the reason for the bark. When he realizes there's nothing to bark at, then he settles down ( or he listens to my QUIET!) Wierd huh?
Not my theory, actually this one from Chris Bach " Third Way" training.


