Dogs Smarter Than We Thought
Or, if you're a dog person, you've known this all along.
A recent study has shown that dogs are able to do rudimentary math. In an experiement similar to one performed on monkeys, a dog was shown a pile of treats. Then a screen was lowered, obscuring the treats, and the treats were either left along, or a few were taken away. Then the screen was raised.
When a few treats were missing, the dogs stared at the treats for a few seconds longer than they did when the number of treats stayed the same, suggesting that they knew there were fewer treats.