I lost my Strider to lymphoma last year. He was diagnosed and the next day he had his first chemo treatment. He did a full 6 months of the Maddison Wisconsin treatment and 2 half body radiations. He was in remission from the first treatment.
I had a lot of extra time with him because of it. The only symptom Strider ever showed was enlarged glands/nodes in his neck.....which is how I discovered it.
He never acted sick one day until the end. Even through treatment.
Unfortunately, if your dog was diagnosed a few months ago, and no treatment was started, they usually only give 4 months from the day of diagnosis.
Lymphoma is one of the more 'treatable' cancers, but will move fast if left un touched.
Once they start showing real effects of the cancer, I'm afraid it will only be downhill from here. You know your dog best, and will know when his quality days are over.
Strider was sick for only around 4 days. But when the time came, I helped him cross to the bridge. He was surrounded by love, with my arms around him.
Here's his tribute. Strider
I'm sorry you are finding this out too.
Let me know if you have any more questions.
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