I have a male GSD who will be 2 next week, I also have 2 mixed breeds. One 8 yr. old male(gsd/lab mix) and one 1.5 yr. old female.(not sure what she is)Well up until 4 months ago I would feed everyone separately, until my husband decided to try feeding altogether.(while I was away)I guess it has been fine until today. Everyone was finished and the 8 yr. old was slowly walking by and got a snip from my GSD! I was right there and grabbed him and told him NO!! Then I don't know if this made matters worse but, I took some food with the 2 of them and let the 8yr. old eat out of his bowl, then the 2 yr. old. I thought all was fine. I walked away and my gsd went after the 8 yr. old. Again, I was not far, so I grabbed him and told him NO, and in the crate he went. Please help, did I do something wrong?