
I find that pups from about 14 weeks on can start to be a bit fussy with their food - this usually coincides with
teething 
of course if you aren't expecting it you might think that they have gone off their food

soaking the kibble a little usually sorts it out

Then at about 6-7 months - about the time they have almost reached adult size and growth is slowing down - they do it again, stand at the food bowl and look as if to say "is this it?? I was expecting caviar!" if you aren't expecting it then you might think they are bored with their food when in actual fact it's usually that they don't need as much food as they've been getting so they aren't really hungry

Just been through this with my pup of 7 months LOL She would get excited for her meal but then stand at her food bowl looking at me with "that look" on her face

I just cut her food down by a little (I use a measure so I can adjust her food easily) and she's back to munching it like a good-un

If you think it's simple Dire Rear (as opposed to a
really sick pup) have you tried a little Bio Yohurt on her food? about a Tablespoon would do it

I find it's very good for settling tums after they've overindulged or eaten rubbish
Life is what happens while you're making other plans...