A book I have says that the unripe fruit and sap from the leaves is "hallucenogenic" and causes stomach upset.
Is this true?
I have a year-old "accidental" red mulberry growing in the back yard and one of my dogs "plays" by snatching leaves or grass blades and running from me.
I'm worried the tree would harm her if she got hold of the problem parts.

Should I go ahead and remove the tree?
I can't find any other mention of the toxicicity problem on the net.

Any and all help is much appreciated.