My sheltie, Sparky, also was diagnosed with TCC. Like your boy, his tumor is not in a location where it is currently blocking anything. I could not afford treatment of any kind, plus he has other complicating diseases (congestive heart failure being the main issue).
He is 14 years old now and was diagnosed last July. He has made it almost a full year since it was first found and doesn't appear ready to stop any time soon! The only reason why I even learned about it was because he had ultrasounds done due to a bowel obstruction when he swallowed too large of a piece of a duck foot chew. They discovered a mass on his bladder. I haven't seen any blood in his urine, but he does drink more and urinate more, and I've noticed that he does take longer to empty his bladder as the months go on.
The only thing I give him is good food, minimize chemicals in his life (avoid chemical flea treatments, vaccines, etc), and I do give him a medicinal mushroom supplement. There is good research showing that certain mushrooms can help extend the lives of dogs with cancer. It's not a cure, but it appears to help. I mean, I'll never really know how long he would have lived if I never gave it to him, but he is so far beating the odds in terms of how long he has lived since initial diagnosis. The supplement I use is called Immunity, made by Bixbi pet.
http://shop.bixbipet.com/products/immunity
It is not too expensive and the container probably lasts me four months for my 13lb dog. Very cost effective. I also give him milk thistle to support his liver.
My childhood miniature poodle had TCC as well. I think he was diagnosed around age 9 and lived about a year. His tumor was at the neck of the bladder/urethra and it gradually cut off his ability to urinate. He eventually got to the point where he was dripping urine constantly. My father took him to the vet to be euthanized when he started to become uremic. He was 10 years old.
Best of luck with your boy. This cancer is usually very aggressive. Sparky, so far, is doing well. His last bloodwork was normal and he has good energy and weight. The only issues lately is that he gets loose stools very easily so I pretty much keep him on canned pumpkin continuously to keep him regular.