Sounds like my boys.
They never grab. They just sit patiently... their frozen stare... drip drip mouth watering.
My brother has a mastif that sits like that staring at someone eating. That in itself is not a problem but every time he sits like that his firetruck pokes out. Surely nobody wants to see that.
Naturally, you realize what you’re getting from them is pure affection. It has NOTHING to do with hunger.