Is it permissible for a person to keep animals in captivity out of fear of their extinction?

Question:
This questioner, whose name is Sin 'Ayn from the Northern Borders, says: Honorable Shaykh, I have been keeping wild animals for years in a modest enclosure, out of fear for them from extinction. However, I have not been successful in my life, as I have not been employed. He asks: Is my keeping these animals the cause of that, as my friends and family say?

Answer:
There is no need for you to keep these animals while you are poor and in need, because you do not benefit from them. As for keeping an animal in itself, if you fulfill its requirements of water and the food it needs, then if you provide it with what it needs of water, food, and a suitable place, there is no harm in that, except for dogs. It is not permissible to keep dogs or have them in the houses, because the angels do not enter a house in which there is a dog or an image. Rather, it is permissible to keep dogs for one of three things, as the Prophet (peace and blessings be upon him) granted a dispensation for them: either for guarding livestock, or for guarding crops, or for hunting if they are trained. Other than that, it is not permissible to keep dogs. Yes.