Treat Fixation

So I can't get my little white boy to do anything for a treat but sit.... HE STARES AT THE TREAT OR THE HAND HE THINKS its in... SO all he does is sit stare blow bubbles and drool all over the floor.... I just don't know what to do .. I even try to use my older fawn to show him what I want... I will ask Brannon to sit and I give him a treat and then I ask Brannon to Lay and I give him a treat... But all Winston does it stare at the treat... Any ideas???? Winston is very stubborn and I can work with that on some levels... But this staring at the treat and not doing anything is making me crazy!!! So any suggestions are welcome.

***edit** I forgot to add something...

The other thing he does is if I am trying to work with him on Lay down when I take the treat near his nose and then down towards the floor as I get close to the floor he stands up so his head is closer... Any thoughts??