Hi! I am new here and I have a few questions. I met my eldest brother's 2 year old female pitbull terrier yesterday. I came with my mom and my older brother. We pulled in and not a bark out of her she was extremely well behaved and calm great! Well I get out of the truck and she comes to greet me and a neighbor's dog comes to say hello too. Now please note she was perfectly fine with the other male dog. Friendly as ever. He tells my mother and I to go in and she follows me. I gave her attention as usual and I notice...she's not moving from against my legs. It was almost as if she was in protection mode. That's just the vibe I got. She finally lays down by my feet when the male walks in. She immediately jumps up when he comes to me and is going under his head and nudging him away. I thought ok What's this about?! And it got to the point where I could feel tension in the air and she just was acting like she was about to snap at this dog. So I had my mom make the other dog go outside and she does the same thing puts all her weight on my legs and goes into this mode. We left and he texted me this morning saying she's been pacing the floors and crying all night. Guys I have never met this dog before yesterday. I know well I think I know lol a good bit about dogs as I've had several but this behavior is new to me. Why would she be acting like this when she just met me? She doesn't even act this way towards her owner.