Is it permissible to keep a dog at home to protect one's family from specific individuals, given that the entry of these individuals causes family problems, envy, and the appearance of insects?

It is permissible to keep a dog for guarding the house if there is a need for it to prevent harm from people entering the house in the absence of its occupants. The dog should be kept outside the house, away from furniture and belongings, due to the impurity of its essence, and because angels do not enter a house that contains a dog.