I'm dealing with the exact same thing with Olive and I'm finally at the point that I will out stubborn her! She came home from the breeder on Oven baked tradition, but didn't like this at all. I started mixing in Acana in with it and she picked the Acana out. So I just started giving her the Acana. Well that food is very high in protein and fat and it gave her colitis. She was having pure mucous stools (so gross!). I put her back on Oven Baked Tradition, but she would barely eat it. Sometimes I'd mix wet food with it and she'd eat it for a few days, but then she'd stop eating it that way too. I bought her a bag of Blue Buffalo and she wouldn't eat that at all. PetSmart took that back thankfully. A few weeks ago I bought her a bag of Simply Nourish and she ate it for 2 days and then stopped. I haven't bought any new foods as it's obvious she is really picky and it would just be a waste of money! For the last 3 days I have decided that I've had enough and I'm being really strict about food. She is getting no treats. Not even for training. I put her food down at 7am, 12, and 5 pm. I leave it down for 20 minutes. I make sure there are no distractions during this time. If she eats great. If not i pick it up and she gets nothing until i put the food down again. The last 2 days she didn't eat even 1 bite of food. I could feel myself getting anxious about it, but i stuck it out and today she didn't eat breakfast or lunch, but she ate half of her dinner. So really that isn't much for the day, but i'm hoping if i keep this up she'll realize there are no other options for food. It's hard when she refuses to eat because she ends up obsessing over food! I have to put her in her crate when the kids eat now because she stalks them. She'll also get in to any garbage she can. I hate seeing her so hungry that she'll eat garbage, but really that just proves she is being stubborn.