Irresponsible dog owners left almost 2kg of waste lying in an Auckland park for others to pick up, a dog walker says.

Doggy Bush Break owner Nicki Morrison told Newshub she didn't realise how bad the problem is until she started dog walking.

"I collect every single dog poo I see so that I'm not blamed for any left behind. I watch where dogs on my pack walks stop to sniff. They are my poo detectors!"

But she collected a monumental amount of poo on Monday's walk at Warkworth Showgrounds, writing to her Facebook followers she had found nearly 2kg.

Morrison shared her frustrations on Facebook, saying she was "almost in tears" at the shear amount of waste picked up, which took four bags to carry away.

"I just don’t get it. Do you (dog owners) want to lose more places to walk your dogs? It was absolutely disgusting the amount left behind at the Warkworth Showgrounds today."