I have an extremely old female doberman (think grouchy old lady) who is the pickiest thing around. She'll turn up her nose if the canned tuna is white but not albacore. Of course, that was when she was eating tuna. Lately, the only thing she'll go for is skinless, boneless chicken breasts with a little bit of Come 'n Get It. We've tried all brands of dry and wet food - fancy, simple, ridiculously expensive and cheap. We've tried gravy, canned food - everything! Home cooked vegetables and rice - she's even bored of turkey and ground beef. She also has several health conditions so we can't take it to a battle of wills (we have to break before she will). Any suggestions?