Lymphoma is such a common malignancy in humans that there are always new drugs, new protocols and experimental therapy that your regular veterinarian may not be familiar with. Seeing a specialist may be the best way to present you with all of your options. If you are interested in this, ask your veterinarian for a referral. Nausea or infection are possibilities but most dogs do not experience any such complications. While whiskers are commonly lost, substantial hair loss is not experienced by animals on chemotherapy for cancer.
Most breeds have hairs in all diffferent stages of the growth-shed cycle at the same time.
A few breeds have all hairs in the same stage of growth-shed at the same time. A patient in remission is indistinguishable from a completely cancer-free patient. The lymph nodes will go down to normal size and if there were any signs of illness related to the cancer, these should resolve. The most obvious sign will be that the lymph node enlargement has returned. This means that the cancer is now resistant to the drugs being used and new drugs must be chosen.