That is why I don't do this anymore I have had a yorkie (dog from Hell) and he was so agressive with my other dogs he would draw blood. We tried everything. But at last it did not work I valued my life and my babies not to do this. I would be Very careful about any rescue dog you just don't know what is in there past.
I feel it is necessarily to give an update re Polly behavior.
Simply because I just do not want anyone who read information about similar problems and might be afraid to take dogs from rescue/shelter because of that.
So...
Polly is almost different dog now. She has no food aggression at all, I can touch her with no problem when she is eating her valuable
bone...
She easily let me groom her, wash her...
.... still doesn't let me to treat her ears, but she doesn't bite anymore!!!
She doesn't afraid of hands anymore (maybe sometimes, but
comparable what was before, it is like sky and earth...)
The only concern I still have is ... she and Jessica. They are not really friends, and seems like will never be, they are just too different. Everytime Polly is trying to play with her, Jessica is afraid, because Polly is playing as alpha dog.....