![dog](http://i.imgur.com/tOD5g9j.png)
There is a new optical illusion sweeping the web - and it could well be the toughest yet. Hidden in the vintage illustration of a dog is the head of his master - but can you spot him?
The image, posted by Playbuzz, dates back to the turn of the century and was the face of a trade card used as an early advertising gimmick.
If you look closely, you can spot the dog's owner in the middle of the picture - with Spot's ear acting as his hat.
![dog](http://i.imgur.com/IPFPuCm.png)
![dog](http://i.imgur.com/G81bbj6.png)
![dog](http://i.imgur.com/WtoYxet.png)
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