Dog's cannot talk because they lack the mental capacity to connect sounds with words and because their lips and tongues are not conducive to the formation of words, particularly consonants, reports Scientific American. However, domestication allows dogs to communicate with each other and with humans in other ways, such as sitting next to the door when they need to go out.
Numerous pet videos have gone viral on the Internet in recent years and depict dogs "talking" to their owners. Common words and phrases include "I love you" and "Hello." However, the dogs are simply mimicking their owners sounds with their own vocal cords. They receive treats or praise when they attempt the mimicry, so they continue to do it, notes Scientific American.