Hi. I have a male, Shepherd mix named Minsk and was wondering if anyone had some ideas as to what else might be in him? He is approximately 18 weeks old (just a guess from the shelter) and weighed in at the vet at 22 pounds a few days ago. He is a very high energy dog, but is totally non-aggressive. He is great with other dogs and all people including kids. He gets very barky at the park when he wants the other dogs to play with him, but mercifully he is very quiet at home. He is a dream on the leash walking behind my left leg and rarely ever pulls. He does get a bit mouthy and nippy at times, but we are working that out. He is very smart, and knows his commands, but sometimes is only in it for the treats (LOL). Anyways, any ideas?