al mine do it except Cleo, and its sooo funny to watch them try to find something if there is nothing at hand, Alfie and April usually are greeting you togeher with the a bit of the same thing stuffed in their mouths.
Ive been greeted with allsorts from an item of washing, to a tin of beans, (Cleo used to open the kitchen cupboard doors when we were out, so the cockers had loads of tins to choose from)