Quinn agreed and said it was more environmentally friendly to put the dog poo directly under the tree to decompose, without putting it in a plastic bag.
"If you put poo in the bag, put it in the bin," Arn said.
The school had a surveillance camera set up in August after bags of dog poo were dumped in the corner of the school playground over the previous year.
Teacher Anne Earland, who was with the boys when they discovered the latest stash, said the problem had stopped happening on the school grounds, but she was disappointed to know it was still occurring elsewhere.
''It's so sad really and it's not responsible dog ownership.''
She said it was upsetting to know the culprit had made the effort to pick up after their dog, but disposed of it in a way that had become another person's problem.
In this case, those people were young children and they had a message for those responsible — "don't litter", George said.
Central Otago District Council regulatory services manager Lee Webster said it was possible more cameras would be added to the area recently targeted.
He said it was "really disappointing" to know someone was not behaving responsibly.
"It's not hard to pick up after your dog, and take the bag of poop home with you to dispose of. This behaviour is irresponsible and plain lazy."
