
Brinny
I had the same problem, my pup wanted my older dogs one rather than her own. In your case it is unfortunate that the other pup lets him have it.
I would give the bitch pup hers in a separate area for now and if the dog pup loses interest in his, pick it up and put it away, don't let him have it back. Worked for me, it won't take long for him to realise that if he ignores his chew it will disappear. :)
I think you will find it is just a phase.
Regards
Sandra