Bhubaneswar, Oct. 11 -- Optical illusionshave taken over Reddit, testing users' eyesight, focus, and intelligence.

The latest brain teaser asks players to spot a hidden dog in a backyard photo - but only those with sharp observation skills can find it in under 10 seconds.

Shared by Reddit user u/two-kidz on the subreddit r/FindTheSniper, the image shows what appears to be a normal backyard with a dog on the extreme right.

The post, titled "Dog (s)?", hinted that there might be more than one canine in the picture. "First time posting here, wife shared this with me and I thought it should go here," the user wrote.

Couldn't spot it? The second dog is camouflaged right in front of the central tree. If you zoom in, you'll see it blending p...