Just adopted a 6 year old breeder surrender rescue. She seems very deprived of many things, doesn't know how to play, is very guarded over food and water and inhales both (got a slow feed/water bowl). She's great but will not listen until I raise my voice and basically yell. I know she hears me, her ears tell me she hears me but it's like she's intentionally ignoring me until I get loud. Is there anyway to correct this and how?