Both males from same litter, both neutered. We have 1 acre with chickens, ducks and sheep (sheep are tethered in the garden to eat the grass). Dogs have always been good with our 3 kids (14yrs, 10yrs, 6yrs,) come back when called. They bark and guard the house when guests arrive ay house, people are weary of them but they have never harmed. However, since we all hand reared a rejected lamb - to which the dogs were friendly with and cuddled up to - When eldest son was home alone they ripped the lamb to shreds. My son was very harsh on them, but the next day we forgave them and made sure they were tethered when we were not around ( which they are used to). 5 days later whilst we were around (but not in front of us), they killed adult female sheep, and last night (5days on) they killed another adult female. Our two youngest kids now feel scared of the dogs, is there any solution to this situation? And is there a reason why this has happened now, we love our dogs and are a big part of our family life. Many thanks in advance for your prompt response and help - Lisa and family.