Foot fetish is nothing severe to take to a doctor. A guy who has foot fetish has atypical charecterstics, all doesnot match with your situation.
I guy who has a foot fetish, loves to admire women feet and get sexually attracted only by seeing and caressing them. You have given emphasis on something which is not common on a guy with foot fetish.
First thing first, a guy who has foot fetish doesnot care its his wife or not, any nice feet of any woman, he will feel the attraction.
Secondly, they loves the smoothness, curveture of feet. A guy with foot fetish doesnot like any unnatural things like toe ring, anklet or toenail or added art wark. They love it as they way it is, the natural look.
Thirdly, very well said about foot sex, a guy with feet fetish would love to caress the smoothness, as well as love to get a feet job. On a feet job, your toenail is not a factor, a feet job is when you get both the feet together and let his have a erection, then let the dick pass through your feet. Thats the ultimate pleasure. I wish if could add a picture, but dont worry, google feet job or foot job, you will know how to do that. Rather than vaginal penetratio or blowjob, they love a feet job.
I dont think your husband has 100% foot fetish, its a part of footfetish part of other things. May be he has some girl friend before who had some of these, he is trying to get that feeling through you. The wives are really worried about their husband who has a foot feyish because no matter how the face is, any girl with a smooth leg, they fall for that. If your husband only falls for your feet, then its wishfull or controlled feet fetish. Jus for an example, I am an assman, I love to see a nice shaped ass of a woman, even when thats under clothes. But does that mean its applicable for my wife only? I would feel the same hardon seeing other women ass too, right?
Sorry Devika, rather than solving your problem I am making this complicated for you now. But bring in the communication in place, you will know what he has in mind.