At some point I thought I saw dog muck on my boot, now carried on to the boat in smudges, though only outside. I took it off and as I was right beside our bedroom, I was able to change shoes easily. After we had turned I found time to tackle cleaning the area and the boot. I concluded from the lack of pungent odour , that it might have been goose or some other bird, not a dog. As there is plenty of bird deposit splatted about, and it doesn’t smell, I was now less worried about it, but still gave all the soiled areas a good clean and trained the boot through the water as we were moving along – quite effective at cleaning it! I left the boot to dry outside again.