Hi all...it's my 3rd day with my newly adopted dog. I picked him up from the SPCA. He's part Border Collie, part Australian Shepard. He's about 1 year and 4 months old. We spent a couple of hours trying to get to know him before taking him home, and at the time, he seemed really good with my kids. The dog gets along really well with me, my wife, and my four year old. However, I noticed that he growled at my 1 year old this afternoon when my one year old was chewing on something near him. This evening, he did it again when my one year old walked toward his bed, this time he looked like he would've nipped her if my wife wasn't so quick to respond. After these events, I'm pretty worried. Did I pick up a crazy dog, or is this something that I can try and resolve? He seemed well cared for from his previous owners because he seems good with people, other kids that have come by since, and seems well socialized around other dogs. He loves to play ball, and except for this one thing about him growling at my baby (this really big thing to me) he seems like a perfect dog. I'd appreciate any advice that anyone would give me. What should I do? Take him back? Train him? How?