Mine does that once she's grown bored of her once "new" food. Rather than changing the brand all the time and encouraging her pickiness, we just try making eating "fun" for her. I didn't want her to hold out all day waiting for yummier food then stocking up just before bed while barely grazing during the day.
Every morning, the hubby would train/treat/play with her using her Orijen (the one she's most reluctant to eat and only eats when she's desperate). She'd eat anywhere from 10-40 pieces (they're pretty big, round, and dense as far as kibbles go--almost the size of Mentos but less thick). Sometimes she goes on her own to her food dish and grazes a little bit before he gets around to feeding her. During the day, she'd snub her kibbles unless there's a new one mixed in. Generally around 3pm, I can get her to eat some more. And the hubby tries feeding her dinner of Orijen at 7pm.
While we take her out in the evenings, we're extra generous when we give her "treat" rewards, which are actually "real food" (NB Potato & Duck small bites) and she eats it happily. We have stopped feeding her cheerios.
This way, we know she's filled with real food and she doesn't know it.
But I still give her 100% natural dried salmon jerky on occassion however, they seem to have gotten "more dry" and hard since the packaging design changed so I've given less. She also doesn't care much for the NB Vegetarian formula I recently bought to add to her Orijen. Other than her first serving of it where she'd eat that and skip over the Orijen mixed in, she has treated it as the lesser evil of the two so she won't eat unless she's hungry before bed.
Normally, when we get home from her evening outing, she will still eat more kibbles before bed. When she was on Orijen and Petcurean's now! turkey and duck for puppies, she did a LOT better. She'd eat that more willingly on her own throughout the day. This lasted for a couple of months until I had to buy a new bag and they had a new formula! Couldn't find the same one! They added salmon in the mix, but not sure what else changed since she started reacting to it (paw licking and scratching). I stopped feeding that as soon as I got her Natural Balance LID potato duck. It was either her food or the Cloud Star Buddy Rinse I started using on her (only once, and don't want to risk it again!) since both were changes that happened at the same time.
