Taylor is the same...she will devour something new and tasty and then turn her nose up if i give it to her again.
Generally I feed her dry food in the morning and most times it's carried over for dinner because when i get home it's still in the bowl. My vet told me Vitamins aren't necessary if she's eating a balanced food which she is.
you know what I did the other and it works like a charm!? i tipped her food out the bowl in small amounts onto a place mat and she ate the whole lot but will turn her nose up if it's in the bowl. I just make sure it's a clean surface so she isnt eating sand! I also noticed her tags on her collar bump the dish when she eats and she doesnt like the sound. I have found a "tag silencer" now for that!
they are just fussy eaters. you have to stick it out with them and not cave in. i find that feeding home cooked food spoils her even more and she is less interested in the dry food when I give it to her on it's own.
I also mix some veg into her food...she loves butternut, peas, corn and beans to name just a few. apparently from a previous post i read, low fat cottage cheese also helps the appetite??? i have bought dog gravy too which she loves and i give it to her every couple of says just to give her a treat
try some variation...i suppose if i was fed the same biscuits twice a day, every day of my life i would also turn my nose up at it! lol!