Just like people siblings get into fights sometimes. It's good yo break it up if you feel like they are being yo rough but they will often work it out themselves. I had this problem for a while when I first brought home Molli, she was such a rambunctious pup. Training and more excercise worked wonders also, sometimes the 'aggressor' just has a little more steam to blow off. It's totally normal, it'll be ok!
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