Lymphadenopathy More Condition_symptoms My Dog Has Generalized Lymphadenopathy For About 45 Days, All Test Have Come Back Normal Any Ideas?

My dog has generalized lymphadenopathy for about 45 days, all test have come back normal any ideas? - lymphadenopathy more condition_symptoms

He was 11 years and was in perfect health throughout life. During the last months of his big and swollen lymph nodes are touching tightly. He had a Pap test were normal and an increase in eosinophils, and blood was normal. Ideas?