THEY say dogs are a man's best friend... but not these mischievous mutts.

Last month we told how rugby star Petrus du Plessis posted an innocent good luck message to his wife who was running the London Marathon – while being photobombed by their POOING pooch.

Off to the #LondonMarathon today! Good luck to everyone running it! Rather you than me!! She is ready! 😂😂😂 pic.twitter.com/SUszxrrec8 — Petrus du Plessis (@PetrusduPlessis) April 23, 2017

The athlete wasn't the first person to have her picture ruined by a pesky pooping pup.

These otherwise lovely photos were ruined when desperate dogs answered their call to nature.

The hilarious snaps, currently taking the internet by storm, all feature a squatting hound in the background while oblivious couples, friends and families grin away at the camera.

Many of these mutts have clearly strolled into shot at exactly the wrong moment.

14 We're not sure what Kelley will make of her 'special' birthday message Credit: TNI Press

14 This couple's romantic shot was ruined by a pooping pooch Credit: TNI Press

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One can be seen taking a dump on the sand while a smiling couple embrace on a beach, while another has photobombed a snap of a proud-looking collie dog.

In one shot, a naughty Alsatian has found a spot to go to the toilet behind a young woman who is posing for a photo in a bikini by the side of a pool.

14 This poolside stunner clearly has no idea she's being upstaged by a dog Credit: TNI Press

14 No family photo is complete with the family dog... but not when it's doing that Credit: TNI Press

In another, a family have gathered together for a stunning autumnal shot in the garden... but it's marred by a guilty-looking Labrador squatting in the background.

One unfortunate couple's romantic photo shoot was soiled by a big brown Lab, who picked his spot to defecate at exactly the wrong moment.

Meanwhile another dolled up pair also had their picture ruined by a pooing hound - though we suspect the photographer intended to capture the amusing moment judging by the staging of the shot.

14 Talk about spoiling the moment... Credit: TNI Press

14 Judging by the way this photo was taken we suspect the photographer intended to capture this cheeky canine in the background Credit: TNI Press

14 A gorgeous shot of mum and baby was ruined by a squatting dog in the distance Credit: TNI Press

14 These pals probably wouldn't look so happy if they knew what their pet was up to behind them Credit: TNI Press

14 This Lassie dog was well and truly upstaged by his little friend Credit: TNI Press

14 If only they'd been standing on the ground, perhaps this cheeky mutt would have gone unnoticed... Credit: TNI Press

14 A photographer snapped the incredible moment a dragonfly landed on his finger... but sadly that's not the main focus of this picture Credit: TNI Press

14 Loch out! These dogs really do seem to enjoy ruining romantic moments Credit: TNI Press

14 We imagine this pet dog won no treats for pulling this stunt Credit: TNI Press

14 We bet this mum-to-be howled with laughter when she saw this shot Credit: TNI Press

If you enjoyed this, these hilarious dog Snapchats will have you howling with laughter.

Last week we told how dog owners can be fined between £50-£80 on the spot if they fail to clear up after their pet’s mess.

You could be fined £100 for walking more than four dogs, but it depends where you live.