I once had a dog who seemed to understand words. If I asked her where water was, she would jump up at the sink. But if I asked her where milk was, she would jump up at the fridge. She had lots of toys but if I told her to get her frog, she would specifically pick up the frog and bring it to me. She also watched television. When a dog came on the screen, she would react to it by barking or running over to the TV. I have had several dogs after her, and none of them seemed to be as smart.