I feel for the OP going through this and appreciate this thread and others' responses in it.
Our 11.5 yr old Scottish Terrier (which is our first dog--mine of 11 yrs/wife's of 7 yrs) is currently battling bladder cancer and will probably need to be put down around the holidays. In Aug 2013 during a routine vet visit, the vet noticed blood in her urine. (We never noticed it, any activity change, or accidents.) X-rays looked to be bladder stones, so put on meds. Follow-up visits showed the stones mostly gone, however some mass in an area of the bladder which doesn't typically grow tumors. She started having accidents in the late spring of this year, which prompted return trips to the vet, which showed the mass in her bladder growing. We had surgery in the summer to remove it and have it tested. It metastasized, which our vet gave us about six months left in her and will either shut down her bladder or spread to her lungs. Thankfully it has been slow and the piroxicam and cosaquin have been keeping her "normal" this year.
Currently she is playful, loves to eat and go on walks, and acts like her normal self, other than being in diapers. I hug her every day and try to play with her most days. I get sad wishing that I had more time with her, however with an 11 month old daughter at home, some days become difficult to play/walk her as much as I'd like to. I still don't know what I'm going to do or if I'm going to go into work or not when the time comes.