A dog is as smart as a two year old kid

I'm sure you've had the experience of saying, "Good boy!" to your dog only to have him look at you like he doesn't understand what you said. But did you know that dogs really do understand human words? And not just a few words, but hundreds Words Can A Dog Understand
So next time your pup misbehaves and makes eye contact with you, try saying "No" in a firm tone instead—it may work better than "Bad dog. 

•  It turns out that dogs can understand hundreds of words. In fact, they learn a new word every day! And it's not just the domesticated pups who are capable of understanding our language—wolves also have been discovered to be able to understand human speech and accents. 
  
• Dogs are very good at understanding context and will often be able to work out what you mean even when you're not using a specific word for an object. One reason is that dogs are able to associate words with actions, objects, people and sounds. When you say "walk", for example, your dog associates that word with something happening outside (you putting on shoes and getting a leash).
• Dogs learn their names as puppies, and they'll often respond to the sound of their name. This is because it's akin to saying "I love you" or "you're my best friend." When you call your dog's name, he knows that he's being called into action and will likely come running when he hears it. 
  
• Association. If you say a word over and over, your dog will eventually start to associate that word with something in his environment. For example, if you say "cookie" every time you offer your dog a treat, he'll learn to associate the word "cookie" with the treat itself.
• Can all dog breeds understand human words? This is an excellent question, and one that we've decided to explore in this post. To answer your question: no, not all dogs can understand every single word that you say. In particular, it depends on the breed of your dog. Some breeds are more intelligent than others, some breeds are more trainable than others, some breeds are more sociable than others and some breeds are more independent than others.
•  While it's true that dogs can understand a lot more words than we give them credit for, it's also true that humans misunderstand a lot of what our canine companions want to tell us.

  The reason for this is fairly simple: humans have the ability to communicate with each other via language and gestures, while dogs do not. Dogs rely on body language, which means they use their entire bodies in order to communicate with us—including their tails, ears and eyes. They also have an amazing sense of smell, allowing them to pick up on scents such as food or another animal nearby 

Overall, dogs are pretty good at understanding human words. But we humans tend to underestimate them and only use a few words that the dog already knows. It's important to keep in mind that many dogs can understand more than what you think! And if your pet is misbehaving, it might be because he hasn't been trained properly or doesn't know what you're requesting from him (like playing fetch). So next time you want to call your dog over, try using some new words!