I had the same problem..with my chihuahua and lillian..but yours sounds a little more severe..
what I did was..just let them be eventually the chi understood that lillian is going anywhere and he has to accept that. Whenever she tries to play with him he shows her his teeth and she backs off but he doesn't really want to hurt her hes just pushing her away.
I mean..theyre not the best of friends..but he doesn't just run up to her and go into attack mode |