What i did with cami was whenever she would grab something off the floor i would tell her to *COME* and when she did i would take whatever was in her mouth, put it next to her on the floor and tell her *Leave it* while having her in a sit/stay position. Then i would tell her *Okay* and she would grab it again.

Hope thats of some help. For drop it, i did it the same, except instead of telling her to *Leave it* I would tell her to drop it.