The FeLV or Feline Leukemia Virus can cause a variety of complications in infected cats. If your Grey Tabby or other breed cat has FeLV make sure he is under routine vet care. FeLV can causes anemia, lymphoma and other cancers. There is no cure for this disease. In addition, it causes the immune system to become weak and unable to fight against other illnesses. Because of this, cats with FeLV are more susceptible to viruses and diseases carried by other cats. Other illnesses that can be caused by the FeLV virus include kidney disease and other cancers. Lymphoma is the leading cancer caused by FeLV. It is also known as lymposarcoma and is a highly malignant and fatal cancer of the lymph system. You can help protect your FeLV Grey Tabby by keeping him away from other cats. If there are other cats in the home keep them separated. Talk with your esteemed veterinary clinic Colorado Springs CO to learn more.