A cat purring all the time is a sign of contentment and happiness. Cats will only purr when they are relaxed. However, if a cat purrs under any circumstances, it may also be caused by a respiratory infection. Generally, the cat will purr when the owner strokes the cat, but will not purr when playing or other times, and generally big cats are more likely to purr, so if these two conditions are not met, it is best to take the cat to the hospital. Check it out.
