My boxer Luke

Question
My baby Luke is 7 and half.  Luke first was having problems with dripping his urine and at times making puddles at night while he slept.  I took him to the vet just recently since his right side pre scapular lymph node was enlarged.  He began to drink more excessively and wanted to go out more often. The vet took blood and sample of his urine as well as a chest x-ray.  
The results came back of SUPERCHEM high 14.0 calcium, 0.7 low Albumin/Globin Ratio, 4.0 High Globin,
COMPLETE BLOOD COUNT WBC 11.5, RBC 7.77 Platelet estimate adequate, Differential Absolute,
T4 1.2
URINALYSIS Spacific Gravity 1.010 Low, appearance Cloudy.  
The x-rays didnt reveal much but another Vet who looked at them said they had a spot in the front of the chest showing an enlargement.
The vet then told me that Luke has Lymphosarcoma.  This is hard to believe even though I am aware that Boxers are prone to Cancer.  The vet said that he would have between 3-6 months and Kemo was an option.  The vet did not suggest any antibiotics and no tissue biopsy or bone marrow test.  I am at a loss in taking all of this in.  I had a boxer who developed Cancer and it was noticible and she was on steriods.  If this is true and Luke has Cancer then I will start him on the Prednisone.  I am lost in what I should do in helping my baby boy.  Do I need a second oppinion?  What direction do I take?  Please help me make light of this horrible news.
Thanks
Chris

Answer
Yes, get a second opinion just as you would for yourself.

To choose a vet for a second opinion, call and find out how "Boxer" savvy that vet is. You want one that has a lot of Boxers for clients/patients and does know about the breed.

A vet who is savvy on cancer as well. Especially in Boxers.

Always get another vet opinion when dealing with such a grave issue.

You know you need to treat Luke pronto, and the kind of treatment depends on the final verdict.

A tissue sample is reasonable to determine the type of cancer, or if it is even a cancer. It might be benign for all we know.

Lymphosarcoma has specific testing and diagnoses. Get that second opinion from an established "Boxer savvy" vet.

I wish you and Luke all the best and that the final diagnoses is benign.