
Hi! There is only one definitive test for hearing, which is done in a few centres in the UK. This is the BAER test, and details about it can be found on
this link. (The site is a dalmatian one, but the test is done on any breed.) No other test (dropping keys or clapping your hands) is reliable, as the dog can react to the movement of air, visual stimuli, etc. Details of the centres and contacts can be found at the bottom of the link.