Hi,
I am so sorry to hear about your dog. I have a 16 (almost 17 year old) pitbull who had occasional blood in his urine which became more frequent. As time went on he was getting worse and was at a point where he was incontinent at times and other times he would have an urgency to go but nothing would come out and he would strain to try to get even the smallest amount to come out. Based on his symptoms as well as a urine test specifically for cancer, his vet determined he had bladder cancer. My dog got to the point where he was straining so much that we thought it would be best to put him down. As a last ditch effort, the vet gave us a perscription for flomax (the pill for men with urinary problems). Well it was a miracle. In less than two days my dog was peeing like normal, no more straining. Over four months have gone by since he started having problems and my Porky is still with us. He isnt having any bathroom problems other than occasional incontinence while he sleeps.
I am not saying that the Flomax is the cure, but I know that it worked for Porky. If you and your baby are out of options, I would suggest bringing it up with your vet.
I hope everything works out for you.
Teresa and Porky