to tell you the truth, that really makes no sense at all and I would NOT believe it. Poor science. Doesn't matter if the cancer is one cell or multiple cells in a tumor, cancer cells are rapidly mitotic, fast growing, use lots of energy, and sugar is simple easy energy. It's a mutation in a protein regulation pathway, and with that stop signal is removed, the cell "factory" just runs on a 24 hour shift. 

the reason immunotherapy and the vaccine treatments are becoming successful for those that have had amputation or removal is because of the general prognosis of this disease. This is because the cancer stays within the body, and up to the body to find and immune system to kill the cancer cells as they find them. Even with amputation and chemotherapy, the disease continues to appear. Why is this? 

Tumors of all sorts, once they sense that they are being removed or excised, actually start to metastasize faster. Plenty of studies show this. This is why the cancer does come back even after the amputation and chemotherapy remission. If it didn't, then cancer would be easier to treat across all spectrums. So even after these treatments, the cancer does still exist, just in much lower amounts that is very much undetectable. The general mutation within the genome is obviously still going to exist, because that is who the dog is. 

So why would you stop with a good and low sugar diet after removal of tumor? It's generally better for our dogs anyways and we must remember, cancer is a disease of remission, not cure. No I can't pull a study right now specifically on this cancer diet subject, but makes no sense at all to me. 

Don't mean to sound harsh, but whoever originally wrote that within the canine cancer diet needs to think twice and not spread too much misinformation. Yes a lower sugar diet may not be AS effective after removing tumor, but doesn't mean we should stop.