I could be totally crazy, but don't dominate traits have only a single phenotype for both the homozygous and heterozygous forms? While co-doms have two seperate phenotypes for homozygous and heterozygous - meaning it has a "super" form. I think Mack snows are the best example of this.
In this case, I would look back on your breeding records. What percentage of the hypo x hypo pairing gave you super hypos? If the trait is truely co-dom, then you should have roughly 50% super hypos. If it's around 10%, you're either very unlucky, or I would guess that super hypos are just a very nice example of a dominate hypo.
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