Just as long as it's not a chinese rabbit and soy sauce dish! :0 HE HE HE..
Ok there was studies done with Rabbits eating Soy
Artemy A. Horvath - History of His Work with Soybeans and Soyfoods ...
books.google.com/books?isbn=1928914349
William Shurtleff, ‎Akiko Aoyagi - 2011 - ‎Reference
Soy sauce as a stimulative agent in the development of beriberi in pigeons. National ... Changes in the blood composition of rabbits fed on raw soybeans.
I think a little drop isn't going to kill him but it's not recommended.
Vanessa