Our Fennec is a deerhead chihuahua. He is about 8 months old and he already has super long legs! We don't have an applehead but we have seen them at the park. The apples seem to be more aggressive in behavior. Fennec has a softer friendlier approach towards other dogs and humans. We have a dachshund also who seemed to calm him down. Apples seem skiddish and territorial while deers are more gentle and curious.