Just came across this on Facebook:
Deer Study and Resource Centre
I have just been to investigate an unusual situation where a Fallow deer has befriended a flock of sheep! In November 2010, the buck jumped onto the farm and though it jumped back out, it has since returned and has become a resident. At first it was timid, but now it watches over the flock. The deer herds the sheep down to the in-bye at night to sleep, then out to the fields in the day. If one of the ewes wanders off it quickly gathers her up with the rest. It has even defended the flock against the farm dog, standing in front of the sheep to stop the dog approaching, and the usually common foxes which occur around lambing time have entirely disappeared! Could this be the first case of 'Beware the Guard Deer!'?