My thanks to all. I stand enlightened. And am even more impressed by the depth of expertise available on Mudcat.

I tried today to match the pup's note ("Sir Charles" is his name; not my doing) in case we could work out a few harmonies or descants. But without sucess.

My sincere apologies also to Little Hawk for doubting his pronouncements on dog-yowling. It seemed unlikely that an expert in ear-wax removal would also be into canine vocalisation. But he has proved me wrong.