My Splitter vacillates between being a canine disposal that would eat everything and anything put in front of her to being a stubborn, finicky picky eater. We seem to have come to an amicable solution to our problem.
Although I would like to feed her nothing but dry kibble, Hills Brand Science Diet prescription for adults, she seems to like, no demand, some kind of variety in her eating regimen. In the morning I feed her 1/4 C of kibble softened with some warm water and I throw in a teaspoon or so of boiled chicken or tuna. Since it's wet and I mix in the chicken real good, she can't eat her way around her kibble. She usually devours it and licks the bowl clean within 5-10 minutes. I give her a milk bone to help clean her teeth before I leave in the morning and again at lunch. I give her another 1/4 C of dry kibble at dinner. She usually sniffs and picks at it as if she's being punished. I usually give her about 15-20 minutes and then take it away. If she hasn't eaten most of it, I put it in her crate right before bedtime. If I'm not sleeping too hard, I can hear her munching away at it during the night and it's usually gone in the morning.
This works for us and your mileage may vary. To me, the important
thing is to make sure she's getting the proper nutrition and the dry
kibble is the best form of that nutrition for her teeth. Splitter
is 5 1/2 years old, weighs 5.8 lbs (as of yesterday) and the vet and
vet technician both commented on how nicely her muscle tone is. Although
you did not say how old your Biscuit is, you may have to adopt a different
feeding regimen if she is but a wee puppy.