He will learn....lol...
We have a rescue GSD who 18 months ago was as close to a wild wolf as you could get....It wasnt his fault,just lonelyness and abuse from being a pup had turned him that way..
We also have a cat...She isnt really ours but is in our house most days and sleeps in the living room at nights.....She is a delicate old girl and is 17 yrs old..
There is only one boss though.....And our GSD bows to her on every occasion!..