5. Mastiff
If you measure dogs purely by mass, the English Mastiff often tops the list. Males easily exceed 200 pounds, possessing heavy bones, massive heads, and a deeply wrinkled forehead that gives them a constantly worried expression.
The Mastiff is a dog of quiet dignity. They do not bark excessively and rarely show unwarranted aggression. Instead, they protect their home simply by existing; their sheer size deters intruders. With their family, they are endlessly loving and gentle giant dog breeds. They require moderate daily walks to keep their joints healthy, but their favorite activity is napping on the most comfortable mattress they can find.
You forgot Grayhounds, I had mine for 10 years and she passed at 12, they are amazing creatures and companions.
I’ve owned many different breeds of large dogs. For the past 15 years I have been involved in a Greyhound Rescue group. We find homes for these dogs when they are retired from racing. I currently own three greyhounds. I have owned a total of eight. They are gentle and easy tempered..