Treating pain is arguably the most important role of the veterinarian. This can be difficult in cats due to their limited tolerance for the most commonly used pain medications. Lidocaine is a local anesthetic commonly used to treat pain in many species, including cats. When given intravenously, lidocaine can alleviate pain from different causes. However, no data on the use of intravenous lidocaine for treatment of pain in cats is available. These researchers will investigate the safety and efficacy of lidocaine in different doses.