Canine juvenile cellulitis (CJC) is a well-recognized lymphocutaneous disease that is seen in young dogs. CJC seemed to be immunologic disorder and may have a hereditary aspect. Exact pathogenesis and cytokine regulation on the immune system of CJC are not clear. CJC was diagnosed in two puppies hospitalized in Veterinary Teaching Hospital of Chungbuk National University. To investigate the cytokine regulation on CJC, RT-PCR was performed with CJC affected dogs. RT-PCR 1 was performed with whole blood sample (CJC-B) and fine needle aspirates of the inguinal lymph node (CJC-LN) from case 1-dog, which included $TNF-alpha,$ $IL-1eta,$ $IFN-gamma,$ IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-12 and $eta-actin.$ Blood sample from a normal dog (N-B) served for a negative control of RT-PCR 1 (case 1). $IFN-gamma,$ IL-2, IL-4, IL-5, IL-8, IL-10 and IL-12 transcripts were not expressed in all sample. $TNF-alpha$ and $IL-1eta,$ were not transcripted from CJC-B but from CJC-LN. On RT-PCR 2 (case 2), submandibular lymph node aspirates were used and $TNF-alpha,$ IL-10, $IFN-gamma$ and $IL-1eta$ were expressed. $TNF-alpha,$ 1L-10 and $IFN-gamma$ were secreted from activated macrophages enhance the inflammation in tissue. These results imply that abnormally increased macrophages secret $TNF-alpha$ and $IL-1eta$ in the affected lymph nodes, which attract neutrophils and cause inflammation in CJC.