I had just bought a 12 week old malinois about 5 days ago from a reputable breeder. His mother was a fly dog, and his father is a Sheriff K9. His pedigree shows 4 generations of IPO 3 titles so there should be no issue with his prey drive... But there is. He is not interested in any toys, not interested in playing tug or anything. Is this because he is only 12 weeks old? Does he have low prey drive? Seperation anxiety from leaving his other 3 brothers? HELP!!