Yes, I would think a good sized veiled could eat a snail and dissolve the shell. The shell would probably be very benificail in terms of calcium. I think the real problem here is the bacteria or possible bacteria content of such animals. We do at times serve raw snails where I work but we do remove the entrails before hand serving only the white part. I would think that you could find lower risk feeders then snails and slugs. I would not recommend trying them due to the risk of possible problems.