I could hear a thumping noise. I thought for a moment it was someone hitting something with a rubber mallet in the lane, but then I realised that it was actually coming from Brythen. It was a really noticeable noise, even though he was a couple of feet away from me. As I listened, it slowed and became quieter until it was inaudible.
I've never heard a dog's heart beating like that, even dogs with a serious heart murmur! I don't think he's ill though. He has been at the vets recently to have his shoulder stitched, and they would surely have noticed a serious heart problem. He certainly doesn't lack energy either!