No, combine all the elements into 1 or 2 paragraphs
For the first one I'm not entirely sure, but I would go with both dogs being an effective leader. As for the rest:
Only Spitz is always aggressive
Only Spitz laughs when Curly is killed
Both dogs are big and physically strong
Only Buck began life as a pet
Only Buck becomes aggressive
A. Believable fact
You do learn how to read better as you move to a higher grade
