Every glass shard that breaks becomes a creature something called a ShardKitten. They are like kittens but they are made of glass. This cannot be fixed. They come through broken glass or a glass cup..

They come from a place called a GlassCave when glass breaks they get sent over from the GlassCave and over to you. If you find a wild GlassKitten ask if you can keep it.
Credit to: @Distorted-Reality