Omg, it is so funny you posted this because I have just started working with Stedman on his "sitting"...he has learned in 2 days, I am SO PROUD!! But I had to laugh when I read your post because he too sits even before I say the word, LOL...my husband cracks up because Steddy will do whatever it takes to get a treat, lol. If he sees that I have the treats in my hand behind my back, he automatically SITS DOWN lol. What little rascals they are!! 
