I have a 4 year old poochon that refuses to let me groom her !! 3 years ago she had a very bad experience with a groomer and now is very difficult to handle. She is a MESS and my groomer totally scolded me last time I took her in on how difficult she was. I have tried everything including sedating her at the vets advice , still no go on the brushing or grooming . She actually has bitten me when I have tried to clean her face ( she is a piggy and gets food in her face fur ) any advice on this one ?