Doberman Pinschers

Hi evreyone. I have two female DP's. One is four, and one is two. Both fixed. My four year old (Lucy) has a corn chip smell. I have both of them on Lamb and rice. The smell was worse with a corn food, and is better with Lamb and rice, but still there.

The two year old (Tini)has no smell.

Is there a supplement i can get to "kill the corn"?

Make sure there is no corn in their food, corn starch, corn meal, its all corn, check treats as well. None of my dogs have any corn products if I can help, yet all of their feet smell like corn chips.