There are certian words I can not say in front of my two boys or they go bizzirk. I cant say the words "walk or park". I have been on the phone before talking with whoever and said the word "walk" and man they started going crazy - thought they were getting ready to go for a walk. I cant say 'bone" or they think they are getting a treat and start going crazy. I think my two Yorkies are so smart, i can tell them to go give David (my hubby) a kiss and they do it. They are so cute when I talk to them because their little heads will tilt to the side trying to listen for words they recognize. Do you think dogs know words or is it just the tone of voice?