What are the rules on harming or putting down animals?

“It is permissible to use an electric racquet to kill insects.”

“In the enquired case, it will be permissible to kill the cat but the most suitable method of killing the cat should be implemented, which is having the cat slaughtered. If slaughtering the cat is not an option, then such a method should be adopted whereby the cat experiences the least amount of difficulty.”

“It is permissible for one in the state of ihraam to kill insects that are harmful. Hence, it is permissible to kill these insects. As for insects that are not harmful, then it is not permissible for one to kill them in the state of ihraam.”

“It is permissible to kill such animals/insects which by nature cause harm such as scorpions, snakes etc. It is Khilafe Awla (inappropriate) to kill other insects such as bees, mosquitoes, ants etc unless they advance in causing harm to a person.”