Although Poppy is Generally Good with smaller animals, I also DON"T Reccomend a Schnoodle to be around small animals.  Any dog that is terrier or has terrier in him is not a good idea to let around small animals. and since the Schnauzer is a terrier this is not a good idea. 

       The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them. -Isaiah 11:6

designerdogs.myfreeforum.org (for those who love their hybrids)

Years ago, I had a Schipperke that was just fantastic. They used to kill rats on the barges, yet when I bought a pet rat, she loved it. She also used to play with my house rabbit, & just to see those two playing again would be a big treat! Look up the breed and read about them. They are wonderful little dogs!!!!! 

Normally, I would try to talk you into checking out Rotties, but with the way your BF is, I'd say going with a smaller dog would be your best bet.