I am sorry that you feel I am lecturing you, far from it. I merely pass on the collective as so often directed towards myself, though I have not owned a dog for many years since my conversion from country person to town dweller.
Once standing in a mid Wales farmyard with a collie at my side, I gave it a scratch behind the ears in that spot they seem so much to enjoy and listen to a long lecture from the farmer about us walkers and our dogs. When he had finished I had to point that I did not own a dog and the one at my heel was in fact his own.
I did not realise that the nemotode issue was so important, this particular one migrates in the bloodstream of a cow to the liver, unlike many that only affect the digestive tract. It was a new grudge that farmers hold against walkers and is prevalent in urban belts. My initial concern was that 'stick and flick it' might go unchallenged, without this further information being added to the debate and it is after all people, who walk there dogs, who are those most under scrutiny from the farmer.
My raising my term on a LAF is a result of the many times I have been pointed out as 'you walkers', therefor carrying the burden for all walkers, good and bad, but when the landowners accuses me of spreading a disease of Rhododendrons, I had to grit my teeth and speculate why walkers were more liable to spread fungal spores that deer or badgers.