We generally find that the problem is simply over feeding, as the Frozen Concentrate is a highly concentrated feed. Dogs are individuals - they come in all shapes and sizes e.g. fat or thin, hungry or picky. Each dog has their own needs and our feeding guides are only a starting point to work from.
Something that is worth a go is that if you are currently feeding the product in a thawed state then try feeding it frozen, or if you are feeding the product frozen then try feeding it thawed.
Also check how you are storing the Mighty Mix Frozen Concentrate. If the product has been left to defrost or if is not stored correctly the product may have gone off, which could be a reason for the dog not eating it.