Question: dog breeds that you should never mess with?
Answer: Pit Bulls. Talk about ferocious dogs and pit bulls are one of the top breeds that come to mind. ... 
Rottweilers. This breed of dogs comes from Germany and weigh between 85-110 lbs. ... 
Doberman Pinschers. This is one tough, loyal and aggressive breed of dogs. ... 
German Shepherds. ... 
Boerboels. ... 
Boxer. ... 
Presa Canario. ... 
Alaskan Malamute.