I picked something off the rose I bought today  it looked like some sort of snail, but only 1/4" long. The shell appeared to be oval. I didn't get a close look at it because I wasn't aware that it was a living thing until I saw the underside of the inhabitant just before it fell out of my fingers and into the grass outside the nursery.

Do slugs/snails start out that small, or is this something apart from the usual? I'm wondering what problems I might anticipate, if any.

Thanks very much!

Susan