Brodie was always a fussy dog, then one day aged four she decided she didn't want to eat kibble anymore. Nothing could convince her, she literally would starve herself. I tried for ages before giving up. I ended up moving her onto wet food because of it and things improved tremendously.
I think it's a case of go with your instincts - I would always prefer Brodie ate something she enjoyed, but I know others would be a lot more firm and persevere. You could try soaking it in warm water to see if it makes it more appetising? I also always mixed in a little wet food into her kibble to make it more tasty for her (not that it often made much difference!)