Hey Rosefern,
I have a Min Pin who is the pickiest eater of all, and it turns out the way to get him to eat his dry food was to put it in the blender with water and then put the paste in the fridge to cool it off. I'm imagining he thinks of it as a "treat" rather than food. We originally fed him Canidae, he'd eat enough to survive, then we switched to EVO, and he'd eat enough to survive, then we switched him to Instinct, and he'd eat enough to survive. Since we've tried blending it up, he doesn't seem to care if it's the EVO, Canidae, or Instinct, he eats it all up like he's never eaten before. I don't know if it's because it's chilled, since I've talked to other people in the past few weeks who do the same thing, but they microwave the food to get it warm to the touch, and it has the same effect.
An interesting note, he won't eat canned food, whether it's warmed or chilled, but it doesn't matter what brand of dry food we grind up, he loves it. My wife keeps joking that maybe he sees us putting some effort into feeding him, and that's why he eats it, I personally don't care, he's looking good finally, and if we have to puree his food to get him to eat it, then so be it.
Someone else here mentioned that a problem with feeding the blended food could be tooth decay, but we make sure after he cleans his bowl out, he gets a biscuit, and I'm hoping that biscuit helps to clean the teeth, but we still brush occasionally just to be safe.