Anyone who fondly thinks that picking up dog-poo means there is no dog-poo left is seriously deluded. Dogs do not produce shite pre-packed in hygienic containers, nor can it be completely removed from grass.   A nasty smear will remain which is just as attractive to flies as the intact turd and even more of a threat to children who can't see where it used to be. Arguably, it's better to just leave the turd where it is so that at least we can see where the contamination lies. Dogs are a curse and so are most of their owners, the vast majority of whom think that "controlling" their wretched animals consists of shouting at them from 200 yards away as loudly as possible. The idea that masses of people at festivals, where hygiene is already an important issue, are just dandy mixing it with hordes of filthy dogs is, frankly, laughable. So there.