If you are dealing with a pet behavior problem, consider first consulting with your veterinarian. Many problems may be due to a treatable medical condition.
For example, a house-trained pet may begin urinating in the house due to a urinary tract infection rather than a behavior problem. Your veterinarian will be able to rule out any physical cause of the problem and may also be able to refer you to an animal behaviorist or trainer in your community who has the experience and expertise to help address your pet's behavior problem.
There are also several sites on the internet that offer helpful tips on solving pet behavior problems. In fact, The HSUS's Pets for Life campaign has over 43 informational web pages addressing common pet behavior problems.