Well, Jethro had his appointment and test yesterday.
They were able to collect some cells from his urethra to make the diagnosis for his straining to urinate. It was as I suspected- a transitional cell carcinoma.
Here's an interesting link with photos, explanations, etc.
It was not as bad as it could have been. It doesn't affect much of the lumen of the bladder. Just the neck and the part of his urethra going through his prostate gland. His lymph nodes aren't involved yet, and his chest radiographs are clear.
He is starting the combo treatment mentioned in the article. Hopefully it will decrease the swelling enough to allow him to urinate freely again.
While I dread the thought and process of having to put him to sleep, I think this will make me appreciate him even more while he's still here. However long that might be.
I appreciate everyone's good thoughts, prayers, and concerns. Jethro does as well.
He's coming home tomorrow.