For other dog owners, we all know soon we have to say W for walk or C for cookie and so on. This must be done only because they learn words fast. As with the examples above, I would obviously say the 'fast part' is associated with positive things...they're not dumb! For the complete article: http://animals.howstuffworks.com/pets/dogs-understand-words.htm

I've had a dog in the past. The're to smart for one letter words, like "w" for walk. I wouldn't treat them like that. yes their are very smart and can learn tons and tons of commands and understand them.