Hello, this is my first post. I have a 2 year old Tatra who guards our sheep and goats, and is also a general farm dog who is very good with our pet dog and cats, and non aggressive to people, really just what we wanted. She’s wonderful, but nervous when there’s change with the animals, and aggressive to new animals, livestock or dogs, for a couple of days till she knows they belong. I’m assuming that is normal enough. She has NEVER been aggressive to people, especially not to me,, she is my dog and I am her person. However, we got a 4 month new Tatra pup, she at first was very aggressive as expected, so we kept them on other sides of a secure fence, Here’s the problem. On day 2, we had been taking her in there on a leash, all was progressing well. She decided to take a nap near the puppy. She suddenly woke up (no noise from the pup) and tried to attack him. Ok, my bad, I rushed it. But here’s the scary part. I tugged her back, she stopped, and I said no in a strong voice (guess I should have kept my mouth shut) and she barked extremely aggressively at me. I still had her on leash, and she did follow when I called strongly, but when I put her in the adjoining paddock she barked aggressively at me again. She didn’t lunge or growl, but VERY aggressive bark and body language. This is SO not like her, at least with people, and especially with me. I am sitting by her now in the adjoining paddock, she kind of hesitated when I came back and walked slowly to me and got in a submissive posture so I calmly gave her a little love and all is back to normal. But now I am worried, is this aggressive behavior toward a very involved owner normal? I’m sure I handled a couple of things wrong, but not so bad that she should get aggressive to me, right? Btw my the puppy wasn’t aggressive at all. Can anyone help? Thank you!!