Here is what it says in the book "Storeys Guide to Raising Chickens" written by Gail Damerow
Chapter 7 Table Eggs
page 147
This is from the 195 edition. (Yellow chicks on cover)There is a newer one out last year.(Barred Rock on cover)
"One of the protiens in raw eggs,avidin, ties up the vitamin biotin as one of the eggs's defenses against bacteria, since most bacteria can't grow without biotin.
Pets are sensitive to the effects of avidin and shouldn't routinely be fed raw eggs.
A human would have to be fed two dozen raw eggs to be affected.
Avidin is inactivated by heat."
I was feeding my 20lb dog an egg a day on top of her dry and canned food but she is 11 yrs old and now I mix it all together with the egg then nook it. Doggy omlet.
I just don't want to take any chances on her health at this age.
Sorry, I didn't get back to the post with the info but I have been cleaning cages etc.....
Sandi