My thanks to the AN World email list for alerting me to the following story (a fuller version is here), which must surely be the greatest in acoustic neuroma history ever:

This story warms me to the very cockles of my heart. It's like a real-life episode of Lassie. I'll even overlook the incorrect use of the term "cancer" in the headline. Look, here's Steve giving Wrigley a well-deserved biscuit:

That's the age-old debate settled, then: dogs are much better than cats. Can your moggy detect life-threatening growths by sniffing your ear or, indeed, your urine? Can it 'eck.
As for me, I won't bother going for any more MRI scans in future. I'll just head down Battersea Dogs Home instead.