Is there a specialty near you? Normally you need a referral to get an appt. I am stumped but I am not a vet. It sounds like you really care about your dog and have done more than a lot of people do. Good luck
Years ago that happened to one of my dogs and it wound up it was something with the prostate if I remember.....the vet said the dog would need to be neutered. The only reason I hadn't neutered the dog is the type of breed it was does not always do well with anesthesia and I felt the neutering wasn't necessary. The vet told me that a male dog is more apt to cancer if they are not neutered. I didn't know that at the time or else I would have risked the chance of anesthesia.....but anyhow, it wasn't cancer or anything, the doc knew that prior to the neutering, and said once he is neutered he would be fine and he was, never bled again. Sorry I wish I could remember exactly what the problem was with the prostate, but anyhow after the surgery - he never bled again.