Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 2 years ago

Dog is Najis whether it is used in hunting or  guarding or otherwise.

Islam does not say that it is not allowed to have a dog as a pet, but it clearly says that dog is Najis and you must avoid any Najis item, otherwise your Prayers might be invalid if your cloth or body is Najis.

Hunting and guarding dogs are out of home usually, so there is no risk of Najasah on you from such dogs, but when the dog is at home as a pet , the risk is there.