7 Dogs : Dogs learn by inference. A study with a dog named Rico showed that he could learn the names of 200 different items, and then learnt the names of novel items by exclusion learning, and correctly retrieved those items. Another dog of similar breed managed to learn 1000 different words, both of these dogs were border collies. Dogs are one of the smartest animals in the world partly because of their exceptional memories. Dogs are also able to read and react appropriately to human behaviour and body language. Domesticated dogs have become less intelligent in some aspects, then wild dogs. Dogs that aren’t domesticated have better problem solving skills than domesticated dogs, and when faced with a problem they can’t solve the domesticated dog will look at the human for an answer, where as an undomesticated dog will not.