What is the ruling on keeping a pig in the house instead of a dog, and is it permissible to keep it as a pet since there is no textual evidence prohibiting it, and is it permissible to keep a dog as a pet outside the house?

There is no text that prevents angels from entering a house that contains a pig; rather, the text is mentioned only in relation to dogs. It is forbidden to own a pig, and it is more impure than a dog, and it is not permissible to benefit from it in any way. As for a dog, it is not permissible to keep it for breeding, but it is permissible to keep it only for hunting, guarding, or farming; otherwise, it diminishes the reward of its owner by a qirat every day.