Dozer did the first month we got him (when he was 3 months old), along with picking up pieces of mulch, leaves and his favorite - rocks. He still likes to pick up leaves, rocks and anything else he finds particularly interesting, have to keep an eye on him as he is pretty sly. Thank goodness he doesn't just choke them down and I have time to get them out. I'll stop our walk and say "drop it" when he has a rock, and he usually does. Sometimes I have to fish it out when he has an especially good one I guess