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The snake you have described is a Black Rat Snake. They are black with white under the neck and a light colored underbelly. The have a very painful bite, but are non venomous. The foot has a lot of nerve endings, so getting bitten on the foot and the numbness or pain is common for that area, with the amount of nerve endings. If you would like medical advice I can send this over to the Health Category, since I can only advise you on the snake. Joan