he he he...I trained only billy so far and now starting on Charlotte. One thing I enjoy thoroughly is a vocal dog when it is appropriate to be vocal. For that, you must engage your dog in long conversations if you know them well or meditative silence with music.
The way I thought billy to be vocal when approrpiate is I cuddled him like mad and we excahnges little yelps and kissy squealing sounds.
He is now teaching those to Charlotte when they chew on each other.
Charlotte looks like she has pretty acute guarding instincts. Billytruly is too jealous with anyone he cuddles. My fault.