They said the dogs are able to detect prostate cancer's specific volatile organic compounds in the urine but said an important question remains of how a dog would find it in daily practice.
Prostate cancer is the most common cancer in men in the UK, with more than 40,000 new cases diagnosed every year.
Dr Guest said: "These results are spectacular. They offer us further proof that dogs have the ability to detect human cancer.
"It is particularly exciting that we have such a high success rate in the detection of prostate cancer, for which the existing tests are woefully inadequate."
She said there is now a "reluctance to embrace this tested, time-old technology" but dogs can pick up a scent in a dilution of one to a thousand parts.
There is no single test for prostate cancer but the most commonly used are blood tests, a physical examination or a biopsy.
The research is published in the Journal Of Urology.
- AAP