What symptoms are they? There are many types of lymphoma.
General signs are fever, loss of appitite, weight loss, vomiting, hair loss, increase in water drinking and urination.
If the lymph nodes under the jaw, armpits, behind the knees and groin enlarge, this is indication of Multicentric lymphoma.
Gastrointestinal lymphoma is indicated by a decending of the abdomen as the organs swell.
Lymphoma of the skin presents as itchy hairless patches, as lumps or as inflammed skin.
A biopsy would be needed to confirm it's presence. As for curing him, the only way would be through chemotherepy and even then, it'S rarely cured.
Untreated dogs generally live an average of 2 months after the symptoms apprear.
I wish I had more positive news. I'm so sorry if it is lymphoma.