Killing
      animals which have become a nuisance
Question

                In
      our building there is a feral cat. Is it permissible to kill it?
Praise be to Allah.If a cat or similar animal is
      known to be a nuisance and aggressive, and a man kills it when it is
      acting aggressively for his own protection, he does not owe any
      compensation for doing so. It is like when a man kills an attacker in
      self-defence. And Allaah knows best.