Destructive Behavior in Cats

Victoria Heuer
Jun 19, 2009
5 min read
Image: Photo Grapher / via Image Bank

It is normal for cats to scratch things. They do this to sharpen their claws and exercise their feet. It is also normal for cats to spend a lot of time licking themselves, since this is how they clean themselves. When cats scratch or lick the wrong things and do not respond to discouragement, they are diagnosed as having a destructive behavior problem. Not all destructive behavior is the same, however. When a cat scratches on the wrong things but does not have any other symptoms, this is usually a primary destructive behavior. Conversely, cats that spend too much time licking or scratching at things likely have a secondary destructive behavior. Both types of destructive behavior can lead to problems with other organs, such as the stomach and intestines, if left untreated.

Symptoms and Types

  • Primary destructive behavior
    • Scratching furniture
    • Scratching carpets
    • Chewing on or eating house plants
    • Owner may or may not be around when symptoms first start
  • Secondary destructive behavior
    • Things ruined to get the attention of the owner
    • Owner always sees things get ruined
    • Obsessive-Compulsive related destruction
    • Too much time spent licking its body – excessive grooming
    • Frequently eating non-food items (pica)
    • Owner may or may not be around when behavior happens


  • Primary destructive behavior
    • Not enough supervision
    • Not enough, or the wrong kind of scratching materials
    • Not enough exercise
    • Not enough daily activity
  • Secondary destructive behavior
    • No causes have been found


Your veterinarian will need a complete medical and behavior history so that patterns can be established, and so that physical conditions that might be linked to the behavior can be ruled out or confirmed. Things your veterinarian will need to know include when the destruction first started, how long it has been going on, what events seem to set off the destruction and whether or not your cat is alone when the destruction takes place. It is also important to tell your veterinarian whether the destruction has gotten worse, better, or remained the same since it was first noticed.

During the physical examination, your veterinarian will be looking for signs that your cat has a medical problem, which might be causing the behavior. A complete blood count, biochemical profile, and urinalysis will be ordered. These will tell your veterinarian whether there are any problems with your cat's internal organs which might be causing the behavior. A blood thyroid hormone level may also be ordered so that your veterinarian can determine if your cat’s thyroid level is low or high. Sometimes, imbalances of thyroid hormone can add to destructive behavior.

If your cat is eating items that are not food, a condition referred to as pica, your veterinarian will order blood and stool (fecal) tests to specifically test for disorders or nutritional deficiencies that would lead to pica. The results of these tests will indicate whether your cat is able to digest its food properly and is absorbing the nutrients that it needs from the food. If your cat is older when these behavioral problems start, your veterinarian may order a computed tomography (CT) scan or a magnetic resonance image (MRI) of your cat's brain. These tests will allow your veterinarian to visually examine the brain and its functioning ability, making it possible to determine if there is a brain disease or a tumor that is causing the behavior problems. If no medical problem is found, your cat will be diagnosed with a behavioral problem.

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