Dragon Breeds According to the World of Harry Potter

1. Antipodean Opaleye
2. Catalonian Fireball
3. Chinese Fireball
4. Common Welsh Green
5. Hebridean Black
6. Hungarian Horntail
7. Norwegian Ridgeback
8. Peruvian Vipertooth
9. Portuguese Long-Snout
10. Romanian Longhorn
11. Swedish Short-Snout
12. Ukrainian Ironbelly

Source: http://harrypotter.wikia.com/wiki/Dragon#Breeds