Keeping dogs and the consequence of that in terms of the reduction of reward

Question:
May Allah reward you with good. Finally, we ask you, may Allah reward you with good. If we are compelled to keep dogs in the house, may Allah reward you, if there is a fear of theft and the like, is that permissible for us, or would we be committing a sin?

Answer:
It is permissible to keep a dog for guarding, guarding the farm, or guarding livestock, or for hunting, a hunting dog, for only three purposes in which the Prophet (peace and blessings be upon him) granted a dispensation: guarding the farm, or guarding livestock such as sheep, or hunting in the steppe. In these circumstances, it is permissible to keep a dog for their sake, and other than that, it is not permissible. And whoever keeps a dog other than for these three permitted purposes, a qirat is deducted from his reward every day, and the qirat is like a great mountain. So if a person loses from his reward every day something like a great mountain, what does he gain? And what does he get from behind this dog? And he (peace and blessings be upon him) said:
This is another loss, that a person prevents the angels of mercy from entering his house. If the angels of mercy do not enter it, then the devils enter it, and I seek refuge in Allah. So how does a Muslim deprive himself and expose himself to this great danger for the sake of keeping a dog in his house or accompanying it with him in his car, were it not that blind imitation and imitating the disbelievers have taken hold of some of the ignorant, and some of the lax Muslims. So it is obligatory to be alert to this ugly custom, and this bad custom, and keeping dogs, and accompanying dogs, and sheltering dogs in houses, all of these are among the customs of the disbelievers.