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Can you spot what's unusual about this photo?

A photo of a pet dog has gone viral for a surprising reason.

At first glance – and especially, on viewed on a mobile phone – it appears to be a straightforward snapshot of a golden retriever.

But on closer inspection, the pic reveals something else in the frame.

See if you can work out what it is.

Notice anything funny about this dog? Have another look. Source: Imgur/qredrag
Notice anything funny about this dog? Have another look. Source: Imgur/qredrag

It's ok, we'll wait.

If you still can't see it, scroll down to find out what we're talking about.

The dog has a tiny kitten clinging to its back, whose fur blends in so seamlessly with its own that it can barely be made out.

There it is! Source: Imgur/qredrag
There it is! Source: Imgur/qredrag

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Imgur user qredrag uploaded the endearing pic this week and it set off a wave of amazement.

"Genuinely couldn't find the kitty for a solid minute. This should be the next where's Waldo," one commenter wrote.

Even though the poster titled the photo "Dog and cat", users had trouble working out what was going on.

"Me: 'dog, check. Human feet, check. Other human feet, check. What cat?'" one joked.

"I was waiting for the video to finish loading so I could see the cat..." another wrote.

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