ANSWER: If you are asking about a dog, this doesn’t affect your wudhu. It affects your purity and you must wash the affected area. 

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ANSWER: No, this has no impact on your wudhu. However you are sinful for going in front of the non mahrams without hijab. 

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ANSWER: She should wash the exposed part carefully and then wipe over the cast. But if this would harm the cast, she can perform wudhu without washing the toes. 

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