I am sorry to have to mention this again, but it is a perennial issue in a village of many dog-lovers, walkers and cows. Please pick up after your dog; you will earn the respect and gratitude of all those you share the land with.
This is more than just an aesthetic issue: dog faeces contain micro-organisms that can cause cows to abort and lead to brain damage in sheep, not to mention the potential effects on humans, especially small children.