Dogs may like your feet for the following reasons:
Your feet have a unique smell, which is a way for dogs to recognize their owners.
Dogs think your feet are their own toys and they like to bite, lick and play with them.
Dogs may think that your feet are part of themselves and they like to lie on your feet or use your feet as their own pillow.
Dogs like your feet because your feet can massage and stimulate them, making them feel comfortable and relaxed.
In short, dogs like your feet because they think you are their owner and have special interest and affection for your body parts.