I am having the same issue with Bailey! And what makes it even worse is she picks it up and carries it to her blanket to eat! EWWW!
If you do a search you'll find a lot of posts with suggestions. I went and bought some pineapple today to try that. Bailey ate it if I cut it in very small pieces. Hopefully when it comes out the other end it will taste so bad it'll stop the behavior. That's the idea anyway. If not, I know pet stores also sell powders or pills for this reason.