I would be very careful at first, especially as I see a shepherd in your signature image! My very first best dog in the whole world was a shepherd mix, and had an incredibly high prey drive. She killed my friend's baby bunny in less than a second - pick it up, shook it once to break it's neck then immediately set it down when we screamed - all within a heartbeat's time.

Be very careful, if your dogs have any kind of prey drive/instinct.