Wandiligong's Peter Dixon and his pet poodle Maggie have now entered their fourth week kayaking down the Murray River, paddling over 760 kilometres so far to raise funds for the Albury-Wodonga Cancer Centre.

After the daring duo left the Hume Weir two weeks ago, Peter said it soon became obvious it was going to be a very different trip from the one he and his daughter Hayley embarked on 15 years ago.

"There is no where near as much water in the river this time," he said.

"We bottomed out a few times, got sideways on a few logs, got slammed against a fallen tree and ended up going backwards once."

Peter said the next day the kayak was grounded about 30 times on the way to Bundalong, forcing him to get out of the vessel half a dozen times to get going again.

From Lake Mulwala, the trek was 70 kilometres to Cobram, making Monday, 15 September the pair's biggest test yet.

"I can’t explain it, but by midday we were making such good time, I decided to try and make it all of the way to Cobram," Peter said.

"Our @Safari H20 Kayak was performing better than I had ever hoped.

"We made it in about 10 and a half hours, which included three 20-minute breaks, but it was really 73 kilometres, because Maggie got us lost."

Currently, Peter, Maggie and their support driver, Geoff Barton, are approaching Barham, New South Wales.

"I had worked it out we’ve kayaked about 760 kilometres so far," Peter said.

“Maggie fell in the drink a couple of days ago, but she was not harmed.

“The last three days have been challenging; headwinds all the way and the flow in the river has been really poor, we’ve only been averaging about six kilometres an hour."

Despite the challenges, Peter says he's trying to concentrate on one day at a time.

"If you think about the whole lot, it’s almost overwhelming," he said.

“At most I’m only thinking a couple of days ahead.

"I really need to thank the Howlong Caravan Park, the Yarrawonga Holiday Park and the Tocumwal Tourist Park for giving us free nights accommodation to help us on our journey.

"Once again, thank you to everyone who has donated so far."

To follow along with Peter and Maggie's journey, visit 'Pensioner Pete's Power Paddle for Cancer on Facebook.