Mine reconize the word "TREAT" for sure. Chester reconized the name "Rie-Rie" (my daughter that keeps hime 50% of the time and he just LOVES!) I can tell him "Chester, Rie-Rie is coming!" and he will look at the window by where she parks until she arrives. When he sees her walk by the window, he then looks at the front door. I am fairly certain mine know the word "Nite-Nite" since 50% of the time I say it is time to go nite-nite, they all head to the bedroom.

My "girls" reconize when I say "home/Chester", my son keeps them that 50% of the time that Rie has Chester and they hate traveling in the car and scream like I am killing them... When I tell them "we are going HOME to see CHESTER" they get quiet! Chester is their protector, the peacekeeper of the house when they have a disagreement, they all adore Chester.

I am sure they reconize "GET DOWN FROM THERE!" but they seldom listen.