I have lost 2 beagles to lymphoma Beagle 1 had it subtypef at t cell. Did oral chemo,cancer was indolent so he lasted 1.5 yrs. Never sick. After I put beagle 1 down petting beagle 2 felt his lymph nodes up. Got right into oncologist who blasted him with chemo,he did feel sick and punky but went into remission. He had b cell. Chemo 3 weeks the labs to see how it was affecting him. I got 6 months . It is very,very expensive,I hope you have insurance. Talk to your vet,talk about options and explain what you want for dog.They are making some strides in K9 cancer. They do have vaccine for melanoma. Id gladly answer any questions. You need to move right away to treat. Good luck