The licking of concrete could be a clue that a cat is anaemic. Cats with a low red blood cell count may eat clay litter or dirt, or lick bricks and concrete. When you take her to your veterinarian, make sure she has blood tests done to look for evidence of anaemia and two viruses, feline leukaemia and feline immunodeficiency virus. There are other possible explanations for her new behaviour that could be related to a brain or liver disorder. If no physical cause is discovered, she may be helped with behaviour-modifying medication.