If I were you, I'd take a BEE-BEE gun w/me to the field and when the dogs come into range, pop them in the butt. That will get their mind off deer really quick. Most BEE-BEE guns won't break skin on dogs, but even if it does, it'll give them a reminder not to come back. Had the same problem w/dogs knocking over my trash cans and scattering trash all over my yard. after 2 trash days of popping them in the butt, they no longer do this.
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!