It's *foreign milk proteins* (each word equally operative) which can cause
problems, not necessarily *foreign proteins* in general. The sole purpose of
milk is to nourish *that mammal's* infants. This is what it is designed for.
If you give dog milk to an infant mouse for example, it will not survive.

Stacie
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com