Mothballs can repel dogs for about two months. However, mothballs contain a certain degree of toxicity and have a pungent smell, which can easily cause poisoning in dogs. Therefore, it is best not to use mothballs to repel dogs. If the dog urinates and urinates at will at home, you can use pet-specific deodorant or lemon water. At the same time, train the dog to urinate and defecate regularly to solve the problem.