I've been watching this site for almost a year (since my Lab Po was diagnosed) and have to agree that the advice here is so helpful. We used peroxicam and Pepcid, along with altering his diet to high protein kibble and supplements of cottage cheese and flaxseed oil. Up until a month ago, he was a happy healthy boy with actually more energy than before I changed his diet! He even gained weight!
Around Thanksgiving he became incontinent. We found and bought a WONDERFUL diaper system which you can find online--tinkle trousers--and they made it possible for Po to have the run of the house for another month. But yesterday we finally let our Po go. Two days earlier he had an emergency visit to the vet and needed catheterization to empty his bladder. At that point an ultrasound indicated the tumor had filled his bladder and spread to his urethra and would continue to cause blockages. We took him home and spoiled him for two days, but the fact he was once again spending most of our walks squatting and straining with little results convinced me it was time. It was one of the most difficult decisions of my life, but we wanted him to have a peaceful death at home rather than a painful end, and thanks to our compassionate vet that is what he had. What is difficult is that this cancer often doesn't make a dog look sick, so my Po was still active and eating like a horse. He had just lost his lust for life and, I realize now, hadn't "smiled" in about a month.
I am deeply saddened and missing him terribly, but I'm thankful we didn't let this cancer affect his quality of life for very long. Don't be discouraged because Po should have died months ago...we didn't think he'd last through the summer...and yet the entire family was able to enjoy his company at Thanksgiving. I am SOOO thankful to this group for sharing their experiences and advice. Good luck to all.