A cat will develop organ failure if it is strangled for about 5 to 10 minutes, and then the cat will die from lack of oxygen. It is usually best not to put a collar or a rope on the cat. If the collar is worn, it should not be too tight. Leave enough space for the cat to prevent the cat from being strangled and affecting its breathing. If you find that the cat is strangled, help the cat in time. Untie the collar and send it to the pet hospital for examination and treatment.