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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Is he still able to pass urine or is he just straining with no production?
What kind of dog is this?
What kind of cancer surgery did he have?
Just FYI, I'm not able to write a script for meds. Legally, a physical exam is required for prescription writing.
If he is straining with no urine production, then I would get him to a vet asap. This is a common sign of a urinary blockage from a stone or mass or blood clot. We usually palpate first and see if the bladder is enlarged. If so, we'll go forward with an x-ray to look for stones or ultrasound to look for blood clots or masses.
If the bladder is small, then it may just be an infection and the inflammation leading to the straining. You really want to make sure the bladder can empty, though, before starting meds.
I hope this helps, let me know if you have any other questions.