I keep identical toys and bones out at all times. Eeyore still takes items from the puppy by threatening him, but then I'll grab something similar and enjoy it with the puppy. That way E misses out of the fun if he steals. Then, if E grabs something else than the stolen item and wants to play, I'll reward that with attention. If he keeps taking Tippex's toy, I just grab the one he just abandoned and keep interacting with the puppy, or shut him out of the room if he's being mean. I can't say much about the result so far, other than that it doesn't escalate anything and by the end they're both hppy with their own item again.
Most of the time they play nicely with each other, and can gnaw on the same bone or play tug with noses touching. But if Tippex is annoying Eeyore and not listening to his signals, I'll remove T. To me that's the same thing, to make sure the dogs feel I care about their boundaries and they're allowed some integrity, and that they don't have to escalate into conflict to get left alone. Obviously T doesn't do that yet, but I don't want him to just snap the day he grows old enough to stand up for himself.