Mia hides things too sometimes...I think because Brody will, as DH puts it, "snack it" from her. She hid two pieces of a treat DH gave her last Monday morning, carefully covering them in one of the little fleece baby blankets we put on the bed for them to nestle in by pulling with her teeth and pushing with her nose, and fluffing everything up with her paws, digging like mad. Problem was, she only covered them from her side...they were completely visible from the other side. It was hilarious to watch.
Funniest is that she never came back for the treats, Brody never "snacked" them away, and I picked them up before bedtime.