All the pitbull, staffordshire terrier, presa canario, and cane corso breeds! Meaning, all the dogs that when/if they decide to attack, you will have a real hospital bill with real nerve and tissue damage and disfigurement. I give two craps about the rebuttal that "little dogs bite more." Why? Well, I'm not in the hospital getting surgery, stiches, having to go to physical therapy to regain strength after the flesh aka "gaping hole" left by the pitbull. The issue is, these dogs aren't punks. They are like the Rollin' 60's Crip OG's, not the current aspiring rapper with gang ties, but true original gangsters who are ready to throw down at even the misperception of a challenge, threat, fear, or hey, for sh#ts and giggles it decides to attack. If I have to raise a dog to the point I have to be on all of its transgressions or later on it'll f#ck me up, who even wants it! Say, Im wrong, until u get attacked!