premise: A dog jumps up to take something from a woman's hand. hypothesis: A dingo is biting a woman with no hands.
contradiction: A dog is not a dingo. When there is something in a woman's hand (that a dog jumps up to take) it means that the woman has at least one hand, hence she is not women with no hands. It's not possible that a dog jumps up to take something from a person's hand and is biting a person simultaneously.