and if it's Lymphoma I can give you a wealth of information.

If it is Lymphoma then it's something you need to have confirmed and treated ASAP. In the common form called Multicentric which is characterized by multiple swollen lymph nodes, the expected life span for a dog NOT treated is 4-6 weeks. The cancer will ravage their bodies very quickly. Depending on the treatment selected and other factors the life expectancy of a lymphoma puppy is anywhere from 2 months to 2 years. Mine made it 1 yr 3 days post diagnosis.

The first step is to confirm a possible diagnosis of Lymphoma. You should get an immediate referral to a Oncologist, who can also do the Ultrasound. Insist on an appointment within a week.

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The most common way for confirmation is needle aspiration of a swollen lymph node. If no lymph nodes are swollen, and it's internal then a biopsy might be needed.

This is one case where you have to wish for kidney disease over lymphoma.